Is it me, or should this dinner lady be in a bit of trouble? Or am I just being over sensitive of DD?

[MilliesCookies1]

Using my sister's account (due to a technical reason) and I have already emailed HQ, so this is about my daughter, but her niece.

Anyway... DD is 10, year 5. She has been having some friendship problems. Her best friend has 2 other best friends. She fell out with her best friend as she wouldn't let my DD play this game with them. I said that making up would be the best as they have been friends for years. She went over to their lunch table, her best friend was sitting with her other 2 best friends; she asked if she could sit with them and they all said no and one girl was laughing at my DD (one of the best friends of her best friends) and my DD called her a bitch, I know that was completely unacceptable and I have told my DD about appropriate language now, she has had a punishment for that. However, the mother of the girl who she called a bitch, is a dinner lady/mid-day assistant. She came over and her DD told her that my DD had just called her a bitch, she giggles and said "don't worry girls, I think she's one" and all the girls laughed at my DD. I did ask for a meeting, as I don't think that was particularly fair of the dinner lady, I get my DD should have been told off for saying bitch, but I don't think the mother, who's a dinner lady should start implying my DD is too. They all admitted (even the dinner lady) that she had said everything my DD had claimed she had said. The head teacher looks at me and goes "there you go!" and that was it... No apology (my daughter had to apologise to the other girl) and nothing more was done... AIBU to think that isn't particularly fair? Or AIBU?

[FullTimeOfTwo]

How's it going OP?