I always chat to the same group of mums on a school morning and two of the mornings another mum joins us as she works part time, every morning seems fine except these other two mornings, it can have an awkward feel to it. I'm always polite to all the group, but sometimes this other mum won't even say,'morning' back. Her youngest child has now started saying unkind things to my child. I did ask if there was anything wrong, but she said not. She stopped speaking to me last year for a short while and I have no idea why. I just don't get this moodiness with her. AIBU to think she's just plain rude?