To put it in context, we've been friends for 10 years. We see each other at least once a month. Her DS was born in Jan 10. When he turned 1, I went round to their house (only about 20 mins away) with a card and present. I did the same when he turned 2 a couple of weeks ago. It was my DD's first birthday last week and there was silence; not even a text or email, let alone a card. I've heard from her since but no mention was made. She's had no recent dramas to explain why she might have just forgotten.
It is still annoying me. Should I say something or just grow up and let it go?