It’s just pneumonia.
Why would she have to go to the ER?
Pneumonia in a person pushing 70 isn't something to be trifled with.And with her past history it's even worse.
Why would she have to go to the ER?
There was no need to go to the ER. Her physician was with her and they already knew what the problem was. They went to Chelsea’s apartment were they could treat her in private.
(opinion only, mine is as good a guess as anyone’s at this point).