That's not a surprising story at all. I have witnessed crazy cheer Moms first hand lol.
We had quite a few of them at dd's old cheer gym. And dd kind of made it worse. See, the girls on her team had all started at 3 (one at 2-cause Mom was friends with one of the owner's) My dd joined the team when she was 5, and within six months was doing things the other girls still weren't, like back handsprings. They felt that since their girls had been doing it for 3 seasons at that point they should be getting these skills first, and dd should have been the one to get them last. It got to the point at the end that their was this particular group of Mom's who would stand at the veiwing window to catch dd make a mistake, so they could all comment on it. All the while with me sitting right there. At first it irritated me, but after a while it was almost funny. That a 7 year old kid could ruffle the feathers of these adult women, by doing nothing more than something she enjoyed doing. lol.
One Mom of the group was the worst. Her dd was the more advanced of the group before my dd was there, and after that, her sole purpose for being there was to get her dd to do things before mine. And she would tell people this and the coaches too.
The worst thing I ever witnessed her do......we were at a competition and they had an individual tumbling and jump competition. When she learned dd was entering, she signed hers up too. (And it was very clear at times that this little one really didn't want to be there) DD did her pass a few girls ahead of her, but the whole time we were waiting I could hear her lecturing her daughter that she better not "screw this up!" and making her tell her over and over again what she was gonna do and exactly how she was going to do it. And reminding her "I swear to G$% you better remember this, this and this!!!"
After dd went she wanted to stay and cheer on this little girl, and her other friend who was competing in the jump competition. So we did. You got two chances to do the tumble pass....1st a warm up and it didn't count, the 2nd one was judged. Her warm up wasn't bad at all, she bent her arms a bit on the BHS and her head bumped the ground (it was only a long strip of mat on a concrete floor, their was no spring to it at all) so that was understandable. Her Mom was not happy at all, and you could tell by the silent death glare she shot at her. She goes back to do her 2nd pass.... Starts off with a good roundoff pushes off for her bhs and just sits down. The poor thing looked over at her mom and her eyes instantly welled up. Mom, mumbles something under her breath in disgust, throws her hands up in the air. Turns around and WALKS AWAY! Leaving her sitting there on the tumble mat, crying by herself. Mind you this was a busy arena and it was packed and Mom just left her there and went back to her seat. I was mortified. I felt horrible for her. I was just about to go get her and walk her back over to where the team was, when her Dad who was over at the souvenir table must have saw the whole thing and ran over to collect her and run after Mom.
Sorry for the long post.....had to share.