I apologize, I'm rushing this reply - but I want to address your concern.
I have several girlfriends that are life-long friends, we've been friends for over half a century. So I know how important those relationships are. In many ways I've felt my many-decades friends as closer than my extended family.
If one of my friends treated me the way your friend is treating you (abusively) I'd let the friendship dwindle. I know how hard that is, and how much it hurts to lose so much history. However, your intuition is correct, in my opinion. The woman's passive-aggressive behavior is just plain not cool. Not healthy for you.
If you are able to ask her if something is wrong, or directly "It sounds like you're angry about something. Would you like to talk about it?" That would be terrific. See where she takes it from there. Let her know how you feel. Have a dialogue.
If none of that happens, I think of the old adage...With friends like that, who needs enemies?
__________________
|