I was a nurse for 10 years, and I have to disagree. Unresponsive on a 911 call generally means the person isn't conscious. It's a specific term used to medically denote the seriousness of someone's condition. And using this term when calling EMS can mean the difference of response times. JMO
Also noting, I worked MDS and Patient Care Plans before leaving my nursing career. I was trained to do mini mental assessments as well as overall nursing assessments. Per all reports I've seen, Carlee appears to have been acting very logically and reasonably, she notified police, notified family she was stopping, used her emergency blinkers to safely pull over etc. I have seen nothing at all to suggest any kind of mental break, let alone to the point of hallucinating and talking to a child who isn't there.
She was able to tell dispatch and family her location.
In assessing a person, a nurse would find out about orientation first. Do they know who they are, where they are, what day and time it is? Carlee appears to be fully orientated to person place and time.
Carlee being a nursing student herself, well that may be why she noticed the child on the road when nobody else seems to have seen one. Assessment skills are highly honed in nursing school and work and you start using them ALL the time, not just at work.
Until I see MSM that says different, I believe Carlee.