how to deal with Roommate relationship???

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I am a fresher,it is the first time to live in the dormitory for me. a few days before,my roommate have an agrue with each other,but had been solved in that time.however,yestoday,something has broke out ,I have no idea about how to resolve this problem.just because a girl always selfish,do not care about others thoughts,just do herself.yestoday,after taking a nap,she always has got up gas,and We became her punching bag, not pleasing to the eye and said what she saw, the last door slamming the door also, our dormitory people are special and I angry, but is bad to say in front of her, after all, still in a dormitory. I am so angry,how do i do? do anyone can help me?