Is an aggressive, troubled child forever damaged or are they cured?

My youger cousin literally went crazy when she was only 10 years and so got detained. Then again her upbringing was horrible. I learned she also got sexually abused/molested at an early age.

She developed conduct disorder, violent tendencies toward smaller boys (strangely not girls) and an extreme callous attitude as a result. She was released at the age of 16 and deemed ok but with supervision. She just turned 21 recently and while her violent tendencies apparently disappeared, she admitted to having a thrill for shoplifting for the sake of it. She stole 2 lipsticks from a store just last week and didn't get caught.

The issue is this time if she gets caught doing that (she's not under supervision anymore; she's free), she's going straight to jail... no help, no juvenile detention center, no more psychologist... it's real jail time. Are kids like her forever damaged or cured?

Updates
+1 y
She said she's trying to fight off the urge to shoplift for months now. She has remorse for her past actions/behaviors and violence... she doesn't have any urges to hurt things nor other kids anymore but she now has thrills to steal small items from stores.
Is an aggressive, troubled child forever damaged or are they cured?
Post Opinion