I don't know... I would be concerned that asking (or answering) that question may lead to more problems.

If she said something like, "Well, I responded that way because I had to deal with 3 teenagers before you came in that all constantly kept their iPod on during session and felt disrespected so when you came in with it plugged in I felt frustrated". (I'm just making something up)

I would be concerned that you would attempt to focus on how NOT to be like any of her teenagers (clients, family, friends, or otherwise) and analyze your behaviors as 'good' or 'bad' trying to please your T. When it's really not about her... She explores her behaviors/reactions elsewhere, like consultation, supervision, or something.

Plus, she already admitted she made a mistake and apologized. She recognizes her actions towards you, and I think that is what's most important.