I still don't believe this was a first break. It looks nothing at all like a first break. The fact that she re-appeared and went home makes me even more convinced this wasn't a first break. If it's true she was discharged from the hospital, it makes me triply convinced this was not a first-break or any type of psychosis at all.
A hallmark sign of psychosis -- particularly first break -- is disorganization, paranoia, auditory hallucinations, and fear. As far as we know, this is not the case in this situation. If the 911 call is released and it shows the things mentioned above, I'll amend my opinion, but IMO, with what we know now, this was not a first-break psychosis. I don't know what it was, but it wasn't first-break psychosis. Could it have been something else related to mental health? Who knows. I can't comment on that without more information. But IMO, it wasn't first-break psychosis.
No, nurses don't have to undergo a psych eval to become a nurse. Weaponizing mental health by requiring evaluation to determine competency in delivering healthcare is something that would never be acceptable today, for good reason.