I think either way, she needs to learn that there are consequences for her actions. Everyone is saying because of her age she shouldn't have been handcuffed, find another way to control her....we weren't there, they just may have exhausted all measures to control her and if it had gotten to the point where other kids were in harm's way (and she was destroying property), then I think yes, they did the right thing. I think it's the behavior we need to focus on, not just her age....if an older child started doing that in class, destroying property, putting classmates and staff in harm's way, the police would probably handcuff them too. You're breaking a law and there's a consequence and regardless of age, everyone has to be held responsible for their actions. Does she understand what happened? Probably not....but because there was a consequence, hopefully now she will know that if she throws a temper like that - she gets in big trouble.
I think they probably did the right thing. They would probably have less physical contact with her by handcuffing her than if they tried to restrain her by using their hands until they could get her to calm down. I've been a pre-school teacher, and when you get a kid who doesn't respect authority and they start throwing a fit and fighting and flailing around, it is hard to protect their dignity AND stop them from hurting someone. This girl knocked over a bookcase, for one. Sounds like she hasn't gotten the right kind of training at home to control her anger, or there is something mentally or emotionally wrong with her that she can't control herself at 6 years of age. Such a sad story.
Several years ago I worked at a preschool/private kindergarten that provided care for mild/moderate emotionally/mentally challenged children. These children would not have been allowed to stay enrolled in a traditional care center/school. There were several children that would act out in this manner. My bosses solution was not one that I cherished. She would have an employee sit on the floor with our back against the wall. Another employee would bring the child to us and set them down between our legs with their back against our chest. They would then cross the childs arms and we would reach around the child and grab their wrists, making a human straight jacket. We would then take our legs and wrap them around the childs legs. This was possibly the best way to secure the child, but still left us open to be assaulted. Several times