A state attorney-general says she will consider a High Court challenge after a teenage murderer was granted a reduced sentence on appeal.

The teenager, who murdered a mother of two during a Christmas holiday home invasion, has had his time in detention reduced by almost 18 months on appeal.

Following a successful appeal on Friday, the teen will now serve a minimum of about eight years and four months in detention instead of about nine years and nine months before he is released under supervision.

Queensland Attorney-General Deb Frecklington said the appeal was an unacceptable outcome and claimed it was caused by the previous Labor government’s “weak laws”.

“I am now looking at my options to make an appeal to the High Court,” she said.

Queensland Labor has been contacted for comment.

Mrs Lovell’s husband, Lee, who was wounded during the home invasion, was unable to attend court on Friday when the appeal decision was handed down.

The home invasion led to “adult crime, adult time” changes in Queensland law that allow for youth offenders to face a mandatory life sentence for murder with a minimum 20 years before parole.

“The murder of Emma Lovell rocked the State and Queenslanders made it very clear enough is enough and change needed to occur,” Frecklington said.

“The community and Emma’s family will be devastated by this outcome and our thoughts are with them on another very difficult day they should never have had to endure.”

Justice Tom Sullivan in May 2024 sentenced the teen, then aged 19, to a maximum of 14 years with a requirement to serve 70 per cent of that time in detention, after he found the crime to be “particularly heinous”.

The Court of Appeal on Friday allowed the teen’s appeal against the length of his sentence, finding it was “manifestly excessive”.

Justice David Boddice found the 14-year sentence should stand but reduced the detention period to 60 per cent.

He cited the teen’s guilty plea, “genuine remorse and prospects of rehabilitation” as special circumstances justifying his release from detention after serving less than the statutory 70 per cent.

The teen had appealed Sullivan’s “particularly heinous” finding in a bid to get his overall sentence reduced to 10 years.

However, Boddice found Sullivan’s decision to impose the maximum overall sentence available at the time to be “plainly correct”.

“The death of an entirely innocent person, on their own front lawn, as the consequence of a knife attack by a youthful offender… is properly described as provoking a sense of outrage,” Boddice stated.

The teen now has five years left to serve in detention after 500 days of pre-sentence custody in May 2024 were recognised as time served.

The teen’s male co-offender, also a juvenile, was acquitted of murder at a judge-only trial in October.

He was found guilty of burglary and the assault of Mr Lovell and in December he was sentenced to 18 months’ detention – time he has served.