One of my 9 yo DD's school friends has sent out a party invite to the whole year at school and has left her out. She said that she ran out of printer paper but that my DD is invited. I have said that my DD can't go without an invite. The mother concerned is always asking me for lifts for her daugher as she lives locally despite having a nanny, au pair, cleaner, gardener etc and doesn't work while I am a single working mum. Only last Weds she asked me to bring her daughter back from a school concert. One of the other girls in DD's class texted DD a photo of the invite which seemed a mean thing to do too. I am not aware of DD being nasty to this girl or being in trouble. AIBU?