What should I do?

Basically I attend a University in Missouri. My first semester grades weren't great(GPA 2.4) But I am doing a better job on them. However, my stepmother is threatening to pull me out of school and bring me back to Texas. She tells me that her and my father won't pay for me to be up here. It's a 20000 a year school. I could be home permanently by Spring Break. I wouldn't mind going back home. It's my home and I love it. But I like it here too. And this isn't the way I would want to return. She has control issues as well. Any advice???