I can totally understand bwhy that would hurt, but I wonder whether it was just poor choice of words. To be fair if you only email twice a month and she has said you could, I'm surprised she said anything at all! I mean, I think I get what she is trying to say, but it seems to me, from what you have said, a bit unnecessary. I could understand more if you emailed a few times a week, and text etc, but yeah, I would be a bit confused and very hurt too, but it could be really good material, especially as you recognise it is coming from a very young place.