I have the same problem like that before, lucky me, I move out this year. You can try James way, but I try that before, it doesn't work very well.
Here is my advice,
Fisrt talk to her like James said. Tell her that you like the way you are. You are not her, but try to keep everything cool.
If the talking doesn't work, then try the silent treatment. Try not to talk to her and avoid her. If you two see each other less, there will be less fight. It is hard to avoid someone who live in the same house, just try your best.