Honestly, I tried out for my college team with a forward roll. And it's one of the worst, most embarassing things you can do, I was terrified of being asked to show my tumbling. I got spotted on handsprings, and was asked to do something on my own just like Brooke. I've never been a tumbler and I never will be one, but I'm a good level 6 stunter and made the team and competed NCA College Nationals for 4 years.
There's nothing wrong with executing whatever tumbling you have. She obviously wasn't going to do a back walkover or back bend with her injury and I don't think we should be making fun of her for it.