I am sure they are all over this by now, but honestly? Who takes photos of other people and 'shames' them on social media?
So they were sitting in her seats? Obviously that is annoying, but she got a better outcome - being moved to first class. She sounds charming (not). That pic of her kid 'staring down' the couple is hilarious - but also, what was she thinking?! Stop with the over-sharing.
(I bet she wouldn't dare do it now for fear of being called a Karen.)