Its about two girls who escape from jail/institution and make a run for mexico where one of them is adamant that a woman who helped raise her as a child will help them. The smallest girl kills a few people on the way claiming they all made sexual advances toward her.
When they make it to mexico they find the woman they are looking for but it turns out she's a man who is killing other kids and feeding them to her guests in a sort of underground sex/peado club
I know it's a sketchy description as I saw it 7/8 yrs ago
Cheers

Freeway II: Confessions of a Trickbaby (http://www.imdb.com/title/tt0175536/)