what you will do about this friend?

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she is my roommate.i regard her as a friend.she is really a kind girl and always help me in daily life.but there are something i cant stand.for instance,she always regard herself as a beatiful girl.but in fact,her appearans is so ordinary or may a bit of ugly that even doesnt get a boyfriend.and someone have said some bad words about her appearance.considering she is my friend,so i dont tell her that truth.but she is really some narcissistic that i cant stand anymore.so shall i tell her the truth or not?if i tell her,is she still willing to be my friend?