She asked a few weeks ago if she could take the dc out for the day. Nothing overly planned, walk around our tourist town, McDonald's for lunch and then home for some crafts etc. I said she could, I'm sure they'd love it. I usually leave telling them to the last minute in case plans change but when they woke up this morning I told them where they were going.
Then half way through breakfast an hour before I was due to drop them off, she texts to say really sorry but could she just have dc 1 and 2 as it was raining and she finds it hard to keep them all dry and get about town. 
Cue an inconsolable dc3 and I'm really cross that she's let them down.
Would you be cross or AIBU?