I've got a friend and 3 of her kids attend the same school as my son. Every day I see her outside the gate at pick up and she always says 'if you wait for me, I'll walk up with you'. Usually I don't mind this as my son likes seeing her kids even tho he sees them all day at school (same class as 1 of them). But my kids are poorly today (age 2 and 1) and her daughter's class was coming out late so I just text and left. She expects me to wait every single day and it's freezing cold. She doesn't even live near me so we walk different directions and she barely speaks to me on the way home. Today she got shitty because I text and left but it would have taken me ages to find her in the school ground and tell her myself plus my son wanted to walk with other friends. I want to stop this whole 'waiting for her' everyday thing. But how do I say it nicely? Also AIBU?