I'm not sure that your upper-body strength argument is relevant. If the man could not be fully awakened, she should not have tried to move him. She should have made sure that he was breathing, left him on the ground, and called for an ambulance. She could not be sure if the man was simply drunk, or if his diminished consciousness was due to a stroke, heart attack, or some other medical condition.
If there was no ambulance available, and no police backup, then she had the option to simply leave the man on the ground until someone, anyone, finally arrived to help her. That would have been vastly better than what she did.
Your post convinced me that she might -- might -- not be a sadist.
I hope she will be tried. Let the jury sort it out.
Perhaps.
OTOH, the PMSNBC article has a few interesting factoids about policing this reservation that shed some light on how much experience their officers have when it comes to identifying a drunk: