I just now read your post.....I don't know if I would say your T really 'broke' the rules by commenting on something about scenery, and not commenting on more 'therapy' related stuff you wrote; but maybe she is thinking she should have been more firm, less flexible than she was in even making what sounds like an extra, generic sort of comment. But I think there needs to be at least a tiny bit of flexibility in boundaries and I don't think (jmo) that she really dishonored the boundary. (No more than I think my T really broke our boundaries by offering me hugs a few times when we had agreed I would ask - she said something about the boundary getting a little blurred. I didn't think that she broke rules or dishonored boundaries in what she did......but I did agree that we needed to re-define again what the boundaries are. However, I thought it was wonderful that she was flexible to bend a bit according to the situation and the need at that time.... )
I think it's good that your expectations were lower (maybe it would be OK to say that they were more reasonable, if that doesn't seem like a poor word choice, I hope!!) and that you weren't disappointed because you expected more than you got, so that you can be happy with what you did get. I don't know if you should allow yourself to raise your expectations back up to the place where you're expecting an extra line or two though.....because your T might think she did blur the boundary. So my humble advice is to just be happy that she sent you an email with a bit extra this time and try not to expect it each time....and yes, clarify these things in session. Transparency is a good policy in this case....
I hope I haven't put this in such a clumsy way that I cause hurt, because I don't mean to do that...