I would recommend calling CPS for her. If her parents are abusive and aren't helping her situation in any way, she needs some intervention. CPS or another hotline, maybe getting her to go to a relatives house. That's all I can suggest.
I wanted to put dream or georgenotfound but my friend told me that I can't as I haven't seen as many of their videos as the normal fan has, so either DanTDM or Stampylongnose