Why don't you just ask her? Have you ever told her how much you've felt that you've given for the anniversaries past and she barely acknowledges it?
Rather than holding it all in, you could just go straight to the source. Or you could talk to your MIL about it and see what she says. You're stockpiling resentment and that's not good.
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.