Would you mention the anniversary of their spouse's death to a friend?

I always remember the day a friend’s husband died 28 years ago because it is the day after my wedding anniversary. I was just about to send her a note mentioning it and asking how her snow day had gone when I thought it might be crass to mention. She is now remarried and has been for some time. I was wondering which might be the more thoughtful thing to do? She is a very close friend and does not seem to pine for her first husband although she was happy with him for sure. Obviously there is no right or wrong just think it’s a interesting question. Your thoughts?