The thread about this incident in GNG got the lock.
The facts I gleaned from the vid are:
She had been spraying silly string in the direction of a different group of officers, but I couldn't tell if she hit any of them. Even if she missed, isn't the attempt disorderly conduct?
Someone else threw the water that hit the LT -- in fact, some of it hit her.
Even though she isn't spotless, I fail to see why he decided a punch to her mouth was needed to take her into custody.