While I agree it would be silly or her to refuse to go just based on some club she was in in high school, I'd be willing to bet she's been exposed to more women in tech groups throughout her career as well.

This is just speaking from personal experience but a lot of these groups are the "clothing teddy bears and sipping cocoa" variety. It's a little bizarre actually how patronizing some of these events are and it's all self-imposed. It's just too easy to fall into a circlejerk of meaningless talks and discussions about sexism and empty compliments, awards and recognition. I know that's kind of a generalization and not all organizations are like this but I doubt I'd ever go to a women in tech luncheon again either.