How do you help a depressed 15 yo girl?

So I saw in a social platform a girl saying she was depressed. I contacted her trying to help her, she initially said she was 18. So we talked a lot and got a bond in between us, then she revealed she is 15 and turning 16 in one month. She is depressed because her parents abuse her a lot, she tried seeking help but they always sent her back home thinking she was a lying teen. She tried to kill herself twice and even then they didn't help her. She lives in UK and I live in US. I'm 23 and you might wonder "What business has a 20+ talking to a teen?" Well she lied about her age and when she revealed she was 15, she was already very attached to me. She even has a crush on me but I can't just abandon her, she's been suicidal and I would never forgive myself if she killed herself because I left her. She thinks nobody loves her and I'm the only one that shows her love. She wants to live her parents' house and move with me, what do I do? I know all she said is real, she showed me proves and all and I trust her. So how do I help her?

How do you help a depressed 15 yo girl?
Post Opinion