I’m sure she was wearing armor, prob got caught in the neck or femoral.
Scroll through pics at link. In the last one you can see the other cops and their kit on scene, so I assume she was in same. In at least one pic she def has ceramic plates on, in the others it’s hard to tell (I didn’t look too clearly). The knife in the pic is no bueno for stabbing. For them to be patrolling in anything but level IV in this environment would be egregious.