"I think she used that as an opportunistic excuse."
Doesn't matter. If a friend of yours told you about a death, you would have some kind of response for them. It's just common courtesy. She's not trying to trick you or anything. That's your resentment coming out.
There's nothing wrong with being polite.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.