The second clip is very telling. Mom's first reaction is "my precious little snowflake couldn't have done this!" So the teachers, children in the classroom, and resource officer are all lying, because they want your little(5'5 160ish) angel in jail? Probably not.
My wife is a teacher, and has been for over a decade. She sees this kind of kid all the time. My wife has watched kids hit/bite/kick other kids, with her own eyes, and had the "parent" look her in the face and tell her "oh my little Johnny would never do that," and actually refused to believe her. Is it just me, or does this sound insane?
Kids aren't stupid. They know which parent to ask for things, and what they can and can't get away with and where they can get away with it. She may play angel in front of mommy, but I'd be willing to bet this isn't the first instance of this girl acting like a lunatic.
Maybe the kid does have something legitimately wrong with her. Maybe she just has crappy parents that she plays like a fiddle/don't care. That doesn't make it okay to try to kill other students(what else do you call shoving children into traffic?), shoving desks at people, spitting at teachers, and assaulting a cop. The kid should at least get a psych eval and be removed from regular classes until it can be determined wtf is going with her.
Jumbofrank has a great point. If you removed the age, and said "A 5'5, 160 lb female was tased after attempting to shove school children into traffic, overturning desks, and assaulting an officer," it wouldn't be a big deal.