"Why did the Police officers not take her to hospital in their car?"
In the first place, an ambulance had been called but, and I'm surmising here, health and safety coupled with liability further down the road when the dust settles stayed their hand.
Police officers can't take it upon themselves to assess casualties and act as paramedics. They did act when all else turned to *** around them and should be commended for that.
In closing, after five+ years, it maybe, kinda is Dave's NHS