This to me is the critical section:
Basically, tackling a much smaller, much lighter player who was already crouched and bent over, prone.
It tallies up with the photos, which look weird when you look at them first. It looks to me like a really shit, clumsy tackle.
I've done damage to other players in the past through tackles, knocked out a few teeth, broken a couple of arms and probably other damage but not with malice, usually just with force and occasionally poor technique. Could definitely see myself having done this tackle by mistake.
It might come down to what this "belly flop" motion looks like on the video.
If it's clear that the neck/spine were at risk and she knowingly threw the full force of her body down in that area then there could well be scope for serious damages.