These mothers allow their children to be yelled at because they all have visions of their children being "STARS". Watch Toddlers & Tiaras as a prime example. I've noticed it even more this season that it isn't as much about the child as it is about how it makes the MOMS feel. Dance Moms are no different.
IIRC last year Brooke wanted to quit dance for cheerleading but her Mom wouldn't allow her to quit dance. If Brooke wants to have a normal teenage experiences then she should have been allowed to & she should not have signed up to dance for the group for the upcoming preformance season. She had every opportunity to decline to dance with the group when they were replacing Vivi. That was her chance. When my sons didn't want to do an activity or sport any longer, that was fine by me however I did insist on them finishing out their season.