You're right to call it a mere hypothesis. I hope that I made its tentative nature clear.

But that explanation of hers seems to me to be consistent with my hypothesis. No surprise, because it was part of the data that I was trying to fit when I constructed it.

I would be curious to know more about how she responded when you asked her, "So, are you consistently surprised when people undershoot your expectations?" Did she have anything more to say after repeating the question?