Some things just aren't worth persuing and I just tune them out/ignore them. I was driving today with a friend and she wasn't able to put her seatbelt on; it was a "short" trip but I hate the dinging seatbelt buzzer and it was going off every 30-60 seconds I believe. The traffic was bad and the trip took longer than usual. But I finally got "fatalistic" about it; it would eventually end and, that one thing, that one irritant wasn't worth it! So I just bore the "pain" and distraction of it like I would a mild headache or a task I needed to do but didn't want to.

Why waste your energy on worrying about whether your friend is rude or not. Just accept, if she doesn't respond in any way/send a card of her own, that she is. It's just another fact, the unpleasantness of which will be buried by other events happening to you in your life. I don't like some of the Christmas presents I've selected to give to some people but I'll give them anyway and "this too shall pass". You've done all you can to get together with her and she's not responding in a way that makes you happy so drop it until/unless she does something positive to get your attention again.