you don't have to be best friends or even friends to be roommates. just be polite, be courteous, include her, make it not awkward. the more awkward you make it, the more likely you guys will not get along.
that...
Honesty... the only way you could get in a fight is if you bring up any old problem up to her. She told me more about the story and i understand now... And i can see where you had reason to call me out like that. Talk with her... and keep her busy. She needs things to do. Trouble is a result of boredom.
Dont let her do anything stupid haha. Im glad to hear that she is staying with you nonetheless.
Make her dinner...don't leave your shit all over the place for her to bitch about.....don't borrow her clothes without telling her--seems liek the most common fight with girls haha