I'm sure I'll get bashed for my comment...but I think I would have apologized in person. You could have then looked her in the eye and apologized and followed up with: "let's work together on any changes to the rules for out little girl so that we don't confuse or upset her again".
Texting, to me, in a case like this is very impersonal....but that's my opinion.
I was about to post the exact same thing until I saw this. Completely agree.
