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That is not at all clear from your post. It sounds like she just wasn't on the list at all.

This. I think you may want to add that detail to your post. It's really important context.

Ah, I read your post as if you guys literally just showed up and expected to get in. Did they know you were all together?

I think you did the right thing by allowing the rest of the class to attend, but I feel terrible for your student, especially given the push for more women in engineering.

Is there some reason why they couldn't tell you in advance that there would be a problem with this student, rather than waiting until you got there?