I will never give up one her :)
Thank you all for your advice it has really encouraged me to keep going forward. My husband will be getting a fantastic job in a couple of months due to all of his hard work in school. In July our lease will be up on a one bedroom and we will be getting a two bedroom. I think for the next couple of months I will continue being a shoulder for her to lean on and as soon as we have a two bedroom I will pursue it legally. We want to have the finances to buy her a car, a nice bed, and a working computer. It will come in time but the room is necessary before we can win anything legally. It wouldn't look good to a judge to send her from an abusive home where she has her own room...to the couch of her older married sister.
I think I really do need to tell her some of the benefits. In the future we want to take her to theme parks, vacations, and take trips around town. We look forward to buying her clothes from the mall ( she only ever wears my hand-me-downs and thrift store clothes) and she hasn't had new clothes in over a year, we want to get her good healthy food, and really make sure she can see her friends when she wants to.. even have sleep overs with pop corn and movies at our place! Shes never has that at home! I didn't either! My husband had to go through my clothes after we had been dating for some time, and explain why the shirt that has three holes in it isn't okay to wear in public, or how the skirt that I loved that was three sizes to big wasn't something I should continuing wearing...he helped me see a lot of what is wrong without disliking my family, he thought it was my choice to wear the clothes I did. Ross was never even an option. I know it's not abuse but it sucks feeling like all of your friends look down on you and talk about how your clothes could use some help.
Anyways I think I will compile a list of things we want to provide her and when the time comes where we are looking at two bedroom apartments...maybe I should take her with us? Tell her that we could really use some help picking out a good one? Or do any of you think it would be better to try to get her on board before we even start looking?
Again thank you for all of your help, support, and advice. It has really been helping me to think through all of this in a new light :)