I'll be totally honest, I don't think she'll care one way or another if you respond or not. Either way she'll be OK. Our self-esteem is all caught up in the does she care or does she not care and interpreting their response or lack of response. Theirs isn't. She might get hurt if you responded rudely. But just ignoring her won't get your message across.

I'd say something in session though if you are still hurt then...although I would try to say not mean...just "I was hurt when you didn't respond. I thought that you didn't care."