Charlise Mutten's mother sent a series of Facebook messages saying she had found love with her fiance before he allegedly murdered the nine-year-old schoolgirl.
Kallista Mutten boasted to her friends online that she had fallen head over heels in love with 31-year-old Justin Stein.
'He's amazing and treats me so good,' she told one friend, according to the Sydney Morning Herald.
'He's completely loyal and I have no worries, I know his heart is with me.'
Police allege Stein murdered Charlise at his family's Wildenstein estate in the Blue Mountains and then dumped the child's remains, encased in a barrel, in bushland by the Colo River where they were found on Tuesday.
Ms Mutten also mentioned her daughter in several of the Facebook messages with one revealing her excitement to see the nine-year-old at her fiance's family property in remote Mount Wilson for Christmas.
Charlise Mutten's mother sent a series of Facebook messages saying she had found love with her fiance before he allegedly murdered the nine-year-old schoolgirl
Kallista Mutten boasted to her friends online that she had fallen head over heels in love with 31-year-old Justin Stein
A mock-up of the Facebook message Ms Mutten sent to a friend boasting about her love for her fiance Justin Stein
'My daughter comes on the 21st, so I'm looking forward to that,' she wrote on December 5, the Herald reported.
Ms Mutten met Stein while she was serving a three-year-prison sentence after getting behind the wheel while high on ice and causing a car crash that killed her passenger in 2017.
The couple exchanged letters until Ms Mutten was released from prison and the pair became engaged shortly afterwards. They had been making plans to move to far North Queensland to start their lives together.
Kallista Mutten stayed at a $20,000 a month Sydney Clinic at Bronte Beach last November where she boasted to fellow patients of having sex with Stein during an access visit.
Ms Mutten was housed in the Clinic's level two substance abuse unit and was visited by Stein, a fellow patient revealed exclusively to Daily Mail Australia.
The patient said Kallista was 'over the top' and 'very attention seeking' and repeatedly mentioned she had a 'rich fiance' who was 'very wealthy'.
She talked about her forthcoming wedding to Stein in 2022, which Ms Mutten has previously said could take place at the Mount Wilson Anglican Church, just minutes from where Charlise was allegedly murdered.
Kallista Mutten may have mentioned her daughter Charlise once 'in passing' but chatted often with other patients about marrying her rich fiance Justin Stein in Mt Wilson this year
At the Sydney Clinic, which treats celebrities, Kallista Mutten boasted of her 'very wealthy' fiance Stein and proudly described how they would be getting
