The eldest daughter of disgraced YouTube star Ruby Franke has made a bombshell announcement just days before she releases her tell-all book about the horrors she faced at the hands of her mother.

Shari Franke, 21, shared a photo to Instagram last week, showing a ring on her manicured left hand – as she announced her engagement and told her 621,000 followers she will no longer be sharing details about her personal life.

‘I’m excited to share that I’m engaged!’ the child’s rights activist wrote. ‘However, for me, this is the end of me sharing my private life.

‘I’ve had my voice and agency taken for so long and now I’m putting my foot down,’ she continued. ‘I’m not going to talk about my wedding, future husband or future kids.

‘I’ll continue to advocate for kids who didn’t have a voice (so you’ll still be seeing me, don’t worry) but this is closure for me. I’m moving on with my life and that’s true freedom and joy,’ Franke clarified.

‘Please respect my privacy and the privacy of my future family and don’t speculate or pry. This is my wish and my gift to my family.’

Shari has long claimed her mother exploited her and her siblings in an effort to get views on YouTube.

Ruby, now 42, was eventually arrested for aggravated child abuse of her 12-year-old son and nine-year-old daughter in what prosecutors described as a ‘concentration camp-like setting,’ and was sentenced in February to up to 30 years in prison.

Shari Franke, the eldest daughter of YouTube star Ruby Franke, made a bombshell announcement just days before she releases her tell-all book about the horrors she faced at the hands of her mother

She shared a photo to Instagram last week, showing a ring on her manicured left hand – as she announced her engagement and told her 621,000 followers she will no longer be sharing details about her personal life

Prosecutors detailed in court how the YouTube sensation, who dispensed parenting advice to her 2.5 million subscribers, subjected her children to horrors including starvation and forcing her son to endure severe sunburn by working outdoors for several weeks without adequate protection.

She would also tell her two youngest children they were ‘evil and possessed’ and handcuffed her son’s wrist and ankles while holding his head underwater. 

During Franke’s trial, jurors were shown disturbing doorbell camera footage that showed her son arriving at a neighbor’s house in shackles, asking for help and directions to the police.

The emaciated and badly bruised 12-year-old had just escaped from the home of Franke’s business partner, Jodi Hildebrandt, police said.

Images displayed in court also showed the two emaciated victims with infected cuts on their legs, duct tape around their arms and feet and scratches and bruises on their bodies.

Over the course of an ensuing investigation, police discovered a cramped safe room in the basement of the home that was locked from the outside, rope that would be used to tie up the children, and adult diapers.

The boy also told police that his mother and Hildebrandt would dress their wounds with honey and cayenne pepper, both of which were later found at the home.

Prosecutors additionally claimed the young children were prohibited from interacting with others and were hidden in the home when people came to visit. 

Ruby, now 42, was eventually arrested for aggravated child abuse of her 12-year-old son and nine-year-old daughter in what prosecutors described as a ‘concentration camp-like setting,’ and was sentenced in February to up to 30 years in prison

The family always seemed happy and healthy in the videos and posts Ruby shared online

By the time police arrived at Franke’s home, Shari said she feared the worst.

‘My initial thought is that my siblings are dead,’ she recently told PEOPLE, as she promotes her new memoir, The House of My Mother: A Daughter’s Quest for Freedom.

In the book, which is due to be released Tuesday, Shari details what happened when she once called child protective services in an effort to protect her young siblings.

‘Ruby’s face contorted with anger and hurt. “I can’t believe you called the police on me,” she began, her voice rising. “After everything I’ve done for you, after all the sacrifices I’ve made. How could you betray me like that Shari? How could you be so selfish?”‘ an excerpt from the tell-all reads.

‘”Selfish?” I repeated, finding strength in my voice. “I was worried about the kids. They were alone for five days, Mom. Five days!”‘

‘”They’re fine,” Ruby snapped. “They’re old enough to take care of themselves. This is about you, Shari. Your jealously, your need for attention.”‘

‘I felt a bubble of hysterical laughter rise in my throat,’ Shari wrote. ‘How could she twist this around, make it about me? But then wasn’t that always her way?’

Shari’s memoir, The House of My Mother: A Daughter’s Quest for Freedom, is due to be released on Tuesday

‘”This isn’t about me,” I said, my voice steadier than I felt. “It’s about doing what’s right.”‘

‘Ruby’s eyes flashed dangerously. “What’s right? You have no idea what’s right. You’re just a child playing at being an adult. Your siblings are terrified of you now for calling the police on them.”‘

‘Ruby’s face hardened, her lips twisting into a sneer. “One day, Shari, you’ll come crawling back to me. Begging for forgiveness. And it’ll be hard for me to give it to you, but I’ll be gracious.”‘

‘”I’m not going to apologize for telling the truth,” I said, my voice quiet but firm.’

But in Ruby’s videos, the family always seemed happy and healthy, Shari previously testified to Utah’s Business and Labor Interim Committee.

‘I don’t come today as the daughter of a felon, nor a victim of an abnormally abusive mother. I come today as a victim of family vlogging,’ she told lawmakers as she advocated for further protections for child influencers.

‘It is more than just filming your family life and putting it online. It is a full time job, with employees, business credit cards, managers, and marketing strategies,’ Shari explained.

‘The difference between family vlogging and a normal business, however, is that the employees are all children.’

Shari addressed Utah lawmakers in October to advocate for further protections for child influencers

She went on to share some of her most traumatic experiences as a child influencer. 

‘Some of our most popular videos were when my eyebrow was accidentally waxed off, and the whole world saw a crying teenager who just wanted to mourn in private,’ she said.

‘Or the time I was violently ill, and got the leading role in the video for that day. My friends became scarce, because dates would be filmed and none of my friends wanted to be on camera.’

Shari added, ‘If I could go back and do it all again, I’d rather have an empty bank account now and not have my childhood plastered all over the internet. No amount of money I received has made what I’ve experienced worth it.’

Now, even as she releases her memoir, Shari told PEOPLE she doesn’t think her mother  will ‘ever comprehend or understand what she’s done.’

‘I just hope that she can get the help she needs,’ Shari said.