Lived in my current house for about 3 months and have a young child. My 5 year old is friendly with the child across the road and they are in the same class at school. I've been helping the mum with some gardening recently and she's said on more than one occasion that it's her daughters birthday this weekend and that she's organized a party. This has been said in front of my daughter so she's now aware a party happened this afternoon and she wasn't invited. I know people can invite who they like but it feels a bit like I've had my nose rubbed in it. aibu?