Creepy in that I wonder if she was in some way trying to see if she would get some kind of reaction out of you? That's a heck of a question to ask anyone, never mind a 13 year old. And it was TOTALLY out of context of the conversation - it had nothing to do with what you were talking about.

If I was your mother I would have reported her - she was way out of line. She doesn't belong working with children. And I wonder if her comment could have been considered sexual harassment.