So, with this diagnosis and today's incident, they decided to take her to Chelsea's apartment when there are two hospitals, Bellevue and NYU, just a few blocks away.
Where she later emerged, pretending nothing ever happened.

Also there is something called a Curb score when it comes to pneumonia.
http://www.mdcalc.com/curb-65-severity-score-community-acquired-pneumonia/Let's look at her CURB65 score (confusion, urea, respiratory rate, blood pressure, age over 65). She fainted and is over the age of 65. Everything else being fine gives her the score of 2, which makes this a high risk pneumonia that calls for inpatient care.
Granted I'm assuming she was mildly confused when she fainted, I'm still surprised she wasn't hospitalised. And then she was fine 90 minutes later.
This really doesn't sound like pneumonia at all.