3rd year in a row DD hasn't been invited to a classmate's party, and 90% of the rest of the class have. Had a falling out with the mum in question few years ago but we made up & put it behind us though we've never been close since. DD & bday girl are friends, not close, but certainly not enemies and others who aren't even friends with her were invited. All the talk today was what a great party it was. Feel like sending the mum a text saying was it really necessary to exclude DD yet again and did she have a problem with me or DD?