Technically she slowed from 106 to 90.. not sure what the state law is exactly, but if it only requires she slows down, she met that statute. I am sure there is very specific wording in the traffic article about what constitutes an emergency vehicle and under what provisions an operator must act. Violating department policy, in and of itself, is not grounds for criminal or traffic charges to be filed.
That being said, I have been a police officer for over 9 years and I cannot think of any scenario where I would find it acceptable to go through an intersection displaying a red light, stop sign or yield sign at 90 mph. I am speaking from MY experience, and I will not bad mouth this officer for her decision(at least not without ALL the details), but I would never attempt that based upon MY training and experience. In my home state of Maryland, we are allowed to violate any and all traffic law while responding to an emergency or pursuing a violator, however, we are required to operate our motor vehicle with due regard for the safety of ourselves and others. Based upon the limited information I see here, it would be very hard to say I was operating with due regard while traveling at 90 mph through an intersection. If I were found to have driven without due regard, it would open me up to a vehicular manslaughter charge at a minimum.
We need to try our best to drive within our means and make decisions to prevent needing emergency backup. I am not trying to slander either officer in this incident, but for younger officers on this board... police in a smart manner. If you are going to go pick a fight with a bad guy, bring a friend along BEFORE the fight starts. This way it limits the need to request emergency assistance. If you are responding to emergency assistance GET THERE SAFELY. You don't do anyone any good getting into a wreck. You divert resources from the officer needing help. Look at ODMP.org, we are losing most of our officers to automobile collisions. I know that the nature of our job is dangerous and serious or fatal collisions are apt to occur, but we need to be as safe and smart as possible to reduce the amount and severity of these collisions.
Slow down and be safe out there.