Need help so me and girlfriend can leave abusive home

Me and my girlfriend have been dating for 2 years now and have been living at her mothers house for one. Her mother is abusive to her and is very controlling. As a minor, she’s been kicked out multiple times, has been threatened, manipulated, emotionally and phisically abused to the point she tried to commit suicide. We aren’t trying to gather money so we can move away hopefully with a roomate. We want to not have contact with her mother after we move away. Right now it’s the only place we can stay. We are now old enough to move, but we just cant come up with the rest of the funds it takes to put a down payment on a cheap apartment. 

Thank you for reading. I didn’t think we would have to come here, but we don’t have any other place to go. Our family won’t help us, as their funds are tight too. We just want to get out of here and go to a place where we can start vocational school together.