And what would that have changed? The officer was ignoring the hospital officials on the phone. He wanted his illegal evidence, and no mere nurse or hospital admin or charge nurse was going to stop him from getting his illegal evidence. He was demanding that she commit a crime for him (which is a felony on his part), and his fellow officers stood by and allowed it to happen (co-conspirators), so they should face charges as well.
The charge nurse provides legal cover for the nurse and represents management of the hospital.