Advice about my girlfriend moving in?

Okay so im 18 going to be 19 soon. I live with my dad. I dont have a job but i collect ssi, plus im going to collage in the fall. My girlfriend is turning 18 in a week and just graduated high school. Weve been together for 2 and a half years. And weve been talking bout her moving in here for a while. Her parents hate me for no reason, well we think its because im a girl. But my family loves her to death. Id just like some advice bout her moving in. Its not like were moving out all by ourselves. Weve planned everything out basicly. We are goning to stay with my dad until we can get on our feet, or wed move in with my moms and pay her 100$ a month, until we move out on our own. And if things get really bad my girlfriend would just move back in with her parents. Id think it would be easier, her parents get in the way of our relationship. It gets bad to the point where her mom trys to get my girlfriends friends to try and break us up. And this is just cause im a chick. Her parents dont care about her happiness at all. Please give me advice. The money things not a issue. My dad has a job and i collect ssi. And shes pretty much here everyday almost. Also some advice on telling my girlfriend what to tell her parents. She siad she was going to leave a note an just leave but i convinced her thatd be bad, they wouldnt take her seirious. So she siad shed tell them a speech. I mean comeone its not like weve been together for only like 5 months. Its almost 3 years and we never broke up. Were perfect for each. I can litterly tell her anything that ive never told anyone before. Even my mom and i can pretty much talk to her bout anything. I usally wouldnt ask someone id just google it but i couldnt find anything on the specific qeustion. Please help and thank you for your time.