To be annoyed at my friend for this?

[Rainbowsandunicornsandpoop]

Friend supposed to be coming to visit this weekend. Rarely get to see her, rarely get to see any friends. My DS has autism and is homeschooled, hopefully getting a SEN school place in the future, but struggles making friends and friend's kids are the only other children he knows right now.
She text earlier and said she's not coming over as her eldest is moody.
So AIBU to feel annoyed that she would cancel, knowing how much me and DS have looked forward to this?
As not to drip feed, I would visit her but she moved to another city and I'm having a really hard time with arthritis lately and I don't drive

It depends on your relationship really. If my best mate said she couldn't come I'd know there was a very good reason for it. Once she called me as she was in the car, about to leave, but she had a massive hangover. I told her to go back to bed. It was fine, I wasn't even annoyed. I trust her implicitly.

How old is her eldest?

Do her children enjoy spending time with yours, or is it just that you are friends with her?

Perhaps her children have other things they'd rather do, and she's trying to hint at that without saying it outright.

I wouldn't mind if there was a very good reason, she's cancelled before due to kids or herself being unwell, other plans etc and it's fine. I just feel that one child being moody isn't a good reason for all the children to be punished.
The eldest is 7.

They seem to do, can always hear giggles and chatter when they're playing, and last time one of them threw a tantrum as they didn't want to leave when it was time to go home.

Maybe she's tired. Try not to let the disappointment eat you up and look to deeply into it. Get a snuggle on and some movies that he loves, even put the tent up in the lounge... make a den.

Loads of disappointments in life, people are flakers.

Well we were planning on a small picnic in the local park (very local, less than a 5 minute walk), so we will likely still do that and have a good time

Ugh now she's saying she's changed her mind and she's coming, apparently she said it when she was angry with DD...