A LITTLE girl who was shot in the head by her mom in a frenzied attack has died.

Olivia Blackmer, seven, was the sole survivor after Tranyelle Harshman, 32, opened fire in Byron, Wyoming, on February 10.

Harshman, 32, killed Olivia’s sister Brailey, nine, and her twin-sisters Brooke and Jordan, two, before turning the weapon on herself.

Harshman died at a Billings, Montana, hospital.

Blackmer was taken to hospital in Salt Lake City, Utah, but a GoFundMe page created in her name revealed she died on Saturday.

“She fought so so hard up til the last minute! Her body and her brain had been through too much, medication helped but we reached a point where medical options were exhausted and her body only continued to get worse,” her stepmom Katelynn Blackmer said.

“She kept fighting through it all though until her heart stopped.

“We are grateful she hung on as long as she did so we could get some valuable time with our sweet baby girl the last five days.”

Olivia’s dad Quinn posted online: “The amount of devastation we feel and are going through is so much.

“The peace I find is knowing that my babies don’t have to be apart from each other and they can also be with their other sisters.”

Quinn was also Brailey’s father, but Harshman’s husband Cliff raised the two older girls from the ages of two and four.

Cliff, the dad of the two younger girls, claimed his wife wasn’t a monster.

“This is so out of character,” he told Cowboy State Daily.

“It’s unbelievable what had happened.

“We’d been getting her help and along the way, something didn’t work. My wife was not a monster.”

Despite claiming Harshman’s actions were out of character, he couldn’t hide his fury.

“I’m so angry,” he told the CBS affiliate KTVQ-TV.

“I don’t even know how to explain this to you.

FAMILY HORROR

“I’m so angry with her for the decision that was made.”

He was out of state, in California, when the shooting unfolded.

He revealed that he was able to say goodbye to his wife, but she wasn’t responsive.

A harrowing dispatcher call revealed Harshman called the cops reporting that her kids had been shot.

She said two of her daughters were in their cribs, while the other two were in their bedrooms downstairs.

Cops revealed the dispatcher on the other end of the line urged Harshman to stay on the phone until officers arrived.

“The female caller stated multiple times that she could not do that and that it was too late,” officers said.

“Multiple attempts to keep her on the line failed and the call was disconnected.”

Harshman’s pals opened up on her battle with post-partum depression.

“You never know what someone is struggling with inside of their mind. Tranyelle was not the monster this tragedy makes her seem to be,” friend Briana Baker told KTVQ.

“Her loved ones don’t want her to be remembered for her darkest moments. She was sweet, loving, and funny. Her children were her main focus in life.”