I'm with stopdog. Whether or not it's a reasonable thing to expect someone to just write to you after they came back from a trip isn't really relevant, to me... the point is that the T offered to do something, and then didn't do it. No matter how small or forgivable the thing may be, I think it's fair of rainbow to expect her T to do what she says she's going to do.

Rainbow, I know the trapped feeling of guilt in "making" T feel bad about something, but really, why did she offer if she wasn't going to do it? Even if you had asked and she had said yes, I would *still* say it then becomes her obligation to do it. If she thinks she can't, she should either say "maybe" or "no". It's not that hard. Or if she just messed up, just own it and say sorry -- especially if it was just "I was so tired, I completely forgot, I'm sorry about that." Not really a big deal. (I'm not saying your feelings aren't a big deal, I'm saying this shouldn't be more than your T can handle.)

I'm glad you're writing here instead of trying to settle it with her now. I think that's the way to go. Sorry you have to sit with it until you can actually hash it out with her.