She shouldn't lose her job if this is the only offense. I don't even think she needs to be suspended. A stern talking to/warning is all this warrants. Stop being so vindictive. People make mistakes, and it's not like she hit the kid.
Good lord, you're so unreasonable. With no further evidence you can make that judgement? What if that's all of those kids' favorite teacher, and she was having a bad day/frustrated with the kid.
She is a grown adult, that is no excuse for taking her anger out on children. You can clearly tell she takes away that mic with malintent, she didn't even use it after she took it away, so for what purpose did she, other then to avoid the poor kid?