Well, to truly know if she's going through PMS, you'd have to know her a year to get a handle on it, they come in cycles, every 26-31 days. However, not knowing your friend, I would kind of ease into the conversation: "You don't seem like yourself lately, is there anything wrong?" If you two are true friends, she will tell you in her own time. For right now, it could be a few things that have nothing to do with you or it could have everything to do with you, you won't know till you talk about it, in the meantime, if you approach her and she still refuses to talk or snaps at you, give her some room and let her come to you. Hope your friend is okay, good luck.

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