The couple's children, aged between two and 29, were found shackled to beds with chains and emaciated at the home on January 14.
Since the arrest, the public has only gotten a few sparse glimpses of life inside the "House of Horrors" through crime scene photos, but the 17-year-old's YouTube videos are offering a new perspective.
Good Morning America also reported that the 17-year-old had a secret Instagram account where she posted mostly selfies and pictures of popstar Justin Bieber.
"You blame me for everything, you blame me in every way, you blame me for what they say, what they say", sings the teen in one of her videos. It's unclear whether the full catalogue of videos still exists online. The videos show the girl singing songs that she wrote herself.
In one, a huge pile of dirty clothes is seen in the corner of a room.
The children's parents, David and Louise Turpin could face life in prison if they are found guilty of more than 40 charges against them, including 12 counts each of torture and false imprisonment. MORE: Outline of accusations against Turpin parentsShe also posted video of two family dogs, in what appears to be her bedroom.
Officers had initially thought the 17-year-old girl was about 10-years-old.
Louise and David Turpin were arrested in the torture and child endangerment case in Perris, Calif.
All the children except for the youngest, a toddler, were severely malnourished, prosecutors said.
One of the girls in the Turpin family appeared on You Tube under a different name.
Authorities said the abuse was so long-running that the children's growth was stunted.
Prosecutors last week added three counts of child abuse against both suspects and one new account of assault against Louise Turpin, according to the Desert Sun. They are each being held in lieu of $12 million. Those who saw the children recalled them as thin, pallid and reserved.
They also allegedly were allowed to take only one shower a year.
David and Louise Turpin, meanwhile, are in jail awaiting their next court date of March 23.
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