so this movie wouldn't excite if she just called 911.

Did you miss the part where she thought he had 10 minutes to live and Harlan said the ambulance would take at least 15 minutes to get there?

Or are you saying if she just explained what happened to the EMTs, everything would have been fine? Because her being his nurse and recently changing his will to give her everything would have made her look very suspicious, she likely would have been accused of murdering him intentionally.

Orrr are you just stating the obvious that is said directly at the end of the movie when it is revealed that she didn't give him morphine at all?

She very excite. Yaaaaaaaas!