Now and then, and after asking if it would be okay with me, it probaby wouldn't bother me. Eating without asking if I minded would not sit as well, but so long as I felt the focus was still there, I probably still wouldn't mind that much, but I'm used to eating and working at the same time pretty much all the time, so I know that if I can concentrate and eat, other people probably can also.

That said, if it bothered you, you certainly would have been perfectly within your right to ask her not to eat during your session.

My appointments are always at the end of the day, and on occasion my T would have a snack while we talked (he always offered to share). It didn't bother me. It wasn't a constant thing or in any way distracting to either of us.