Yep, I just ignore it because I figure they are ignoring some annoying thing that I'm doing.

I know what you mean, though. The mother of a friend is like that. It doesn't matter what medical thing is going on in your life. She's had it before. Hers was bigger, badder and worse than anything you've ever experienced.

After you know this lady better, then maybe you can say something one-on-one to her. Don't confront her in a crowd. Just tell her you notice this habit of hers and ask her if she's aware of it. You're new, so I wouldn't be making any waves right now. This is just one of the annoying habits that makes life "interesting".