well PCP does that to people. most people prolly dont know a whole lot about "hardcore" drugs but PCP makes you go insane. theres no other drug or head injury that would make her go from unconcious and barely breathing with broken bones, to needing 6 officers to withstrain her like that. thats just absurd strength before being hit by a truck at that speed. the way they got angry n screaming like that also hints towards pcp. i guess if you suffer a headinjury your brain could pump some serious chemicals into your body that would do this, but 99.9% of the time ur brain obviously not gonna do that. it never did actually say she was on pcp, but just the way they were acting it resembled numerous symptoms.
and to the conversation about how they were smart about not using weapons, i also think they were very smart about that. to get a call saying people were hit by cars in the fastest lane, get there and see them standing, then get run over by a truck and hit by another, and then need to restrain them, most people would freak and use whatever force they good. very good thinking on their part.