Is it okay to tell my roommate that she is being dramatic?
why do you think she's dramatic?
she's makes so much drama when there isn't any need for it.
Your annoyance is understandable. You're not completely wrong for your feelings and you should tell her about it.
I'd rather her be dramatic than be evil though.
Well if you want a more peaceful home you're well within your rights in asking her to tone down the dramatics. Hopefully, she can take the suggestion well and not try to passive aggressively retaliate by acting evil. Try to assure her that you still love having her as a roommate, but just need things to calm down.