Try talking it over with her a week or two after her period. Chances are she will admit that her thought processes during her period were not completely reasonable. I wouldn't push too hard on this point though. Just talk about it with her in a friendly way and let her know you're having a hard time knowing how to best get along with her during those times. Ask her what you can do so that it goes smoother. Understand that she probably doesn't enjoy feeling the way she does either, and may be feeling guilty or confused. Once you can talk about it you can remind her that you're on her side, not against her. Then, next time she does it, maybe you can remind her that this is what you talked about - if she can recognize that her moods and feelings are hormonally-driven, she will develop the skills to cope with it over time, thereby making your life less miserable. She may also want to check out vitamin or herbal supplements.
It took me years to realize what was going on, and it wasn't until I started to notice that about a week or ten days before my period I consistently became emotional and irrational that I figured out that I shouldn't take it so seriously because it was just the hormones talking. It's not always easy to deal with because you feel a certain way and are already reacting emotionally before your rational mind can kick in and go, "Okay hold on...what day of the month is it again?"
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