Some people are funny. She may remember every other parent after meeting them once and fail to remember the OP. That's not a slam against the OP. It's just reality.See, that's just it. I, and I think 99.9% of posters including the OP, would totally get, understand, and be thrilled about that. Even if it were just the 2nd, 3rd, even 4th time she asked him. But he said the same woman has asked him who he is at least 10 times.
Honestly, by that point, I WANT the person in charge of pickup to know who regularly gets my kids. That would make me feel pretty good as I would feel confident that if there were a change in routine it would be noticable to the people in charge of releasing my child.
At the end of the day, does it matter? If she's unsure of who someone is, shouldn't she feel comfortable with her ability to ask? The way I see it, this is a non-issue that shouldn't be followed up on. If pushed, she will no doubt come out looking like a person who is dedicated to the safety of the students.