For context, a cousin of mine and my MIL don't get along, they had a "fight" that escalated very badly. My sons first birthday was last saturday, to which I knew, for the sake of myself, my son and other guests, they couldn't both be invited. I opted for inviting MIL, as inevitably she is DS grandma, which my cousin understood. The next day, my cousin invited DH, I, and DS for dinner, which we agreed to.
MIL today is acting a little immature, in my opinion, she cancelled plans we had due to "feeling unwell", i asked her what was wrong, to which she said nothing was and she would be fine, i insisted as she usually tells me everything and calls me a couple times through the day to vent/rant/talk. she again said she was fine and how she would be better off gone as she wouldn't be a bother to anyone.
after ending the conversation she has uploaded to facebook petty quotes and i messaged DH about his mum being noticeably upset, and almost crying. he didn't seem to bothered by it, almost a little annoyed as if they had argued about something. Since have found out that she expected DH and I to pick a side and ignore my cousin, because of what happens, which i'll add, wasn't as bad as MIL is making out to be, realistically.
Is she wrong to expect that we side with her? Am I wrong for not getting involved?