Past: Person A. acts dumb and helpless to transfer responsibilites to you, to get attention, or as some kind of a manipulative tactic. She texts you during work hours and harass you for every little information that she could easily find on her own by looking it up on the Internet. Wishing to be no longer bothered, you refer her to the website that she already knows to get that information, and she gets mad at you for "insulting her intelligence." But if she is so competent, why play dumb and helpless?

[I think this is more about her not liking the fact that I will no longer "cater" to her demands. I am also at fault here for enabling her for so long when I should have said from the beginning, "Don't bother me at work. Look it up yourself."]

Recent: One day, you come late to a big family function and see her grab a new soon to be in-law, and have a conversation with her. You can see from the gesture that they are talking about the ring on this soon-to-be in-law's finger. When Person A. realizes that you are there ten minutes later, she says "Hi" and asks, "Do you know who S.'s new fiancee is? Is she here yet?" like she has no idea.

[I didn't confront her for pretending to not know the information she already knew because I didn't want any drama.]

What would you have done at that point?