A push forward

Im 20, and my sister is 17. We have very recently left a terrible situation involving psychical abuse. My sister and I have been each others rocks. We managed to get a small cheap apartment, but it's hard to keep up with it. I work two jobs, and 16 hour shifts at one of them, I walk to work every day. My sister is still in high school, and she is constantly struggling to keep up with it, and helping me out around the house. She is having a very hard time finding work, because she doesn't have a way to and from work (I can't pick her up or drop her off because of my crazy hours, that and I don't have a vehicle of my own). It would help us out a lot if she had her own vehicle, and I want to be able to give something back to her. Without her I probably would have given up a long time ago. I don't need the car for myself, but I want her to have something her own, my sister means the world to me and I want to give her what she deserves. I have nobody to turn to, we've cut the majority of our family out of the picture, and I don't want who we have left to see that I'm struggling to care for the both of us (it'll just come out as "I told you so", and I could lose what little custody rights I have of my sister). I'm trying my hardest, but I don't know what else to do.