I feel that this was a grab of opportunity.
But, there is a thought tickling the back of my brain. Her brother on the interview said she teased him a lot, maybe the teasing was a mutual thing.
If someone saw a chance to start grooming her, they might have suggested that next fight she come to them. You never know what a kid will do when they are upset, and what little incidents they really will tell their parents about. When she ran from her siblings, she might not have been running home at all, she might have been running to her new "friend".
Just a thought, but it's been a very persistent thought.
JMO. Unless there's a link, I can't prove it.