Oh, this is sad!
Whatever she has to say is far more important than what YOU have to say.
"I would do anything for you" - but doesn't.
I wish I could say "I have no idea what that's like," but my mom raised five daughters, all roughly a year apart in age, and she never went to finishing school as Jackie Bouvier Kennedy did, never taught us etiquette, and to this day, I may catch myself interrupting and not really listening.
You are very kind to LET IT GO and not confront her about it.
I hope it's only this one person in your life acting this way!