Granny blanked me

[Okaaaaay]

At at school event yesterday and we started queuing up for something. Dd’s y2 classmate was in front of us and turned around to shout ‘hello dd’s name’. Her grandmother then grabbed her and turned her around, totally blanking me.
She’s previously been pretty friendly and knows my dd by name and sight.
Now I’m paranoid that dd has upset this little girl - dd can be a little brusque and I try and get her to be kind, but I don’t know whether she’s just too bossy around quieter girls.
The Aibu is - was the granny a rude cow, because dd and I felt about 1/2 inch tall for the rest of the queue and wanted the ground to swallow me up?

Not sure why you would want the ground to swallow you up. Maybe it had something to do with you personally but maybe it didn't.

She wasn’t probably trying to get her to concentrate on what she was doing. I doubt you even entered her consciousness. And I mean that in the nicest way. She’ll have been preoccupied with her granddaughter.

Just forget it

*was probably

She may have been.

They were with little girls auntie too who were exchanging silent looks and what seemed to be raised eyebrows when they overheard my ds asking for his money rudely:

“ i need money”

I expect gran was trying to get her DGD to queue nicely or was talking to her and didn't appreciate her getting distracted in the middle.

I doubt that she even particularly noticed you there ...

You seem very worried that your DC have done something to upset others. Is this a pattern for them? Even if so, it's probably best just to be the better person by being polite and friendly even when someone blanks you. Plus if they are doing it intentionally, they'll want a reaction so don't give them one.

Did you tell your DS to ask more politely for his money? If so then you've corrected him so no problem there.