pneumonia lack of oxygen

[kbc66]

My mother is 63 years old.  2 weeks ago she was sent to the emergency room with double pneumonia and plusery.  She WAS a very heavy smoker and has COPD.  The pheumonia kind of came out of the blue.  It was very touch and go because they couldnt get her oxygen level up and her blood pressure up.  They finally got both up and had the oxygen up to where she was at 3 liters and was able to use the nose oxygen we thought we were on our way up.  She was moved to a rehab place.  2 days ago she tried to get out of bed to use the bathroom and fell on her face.  She doesnt know how long she was there before a nurse found her.  Since then she has been really, really out of it slurring and just talking really crazy like she is on some major drugs which she is not.  My concern is that she has lost too much oxygen.  Is there a way that I can find this out or do we just need to wait and see.  This is the first time I actually have really surfed the internet and done this but I am hoping I can get some Idea.  I am very far from her and feel really, really helpless so I thought doing as much research on my end would help.  Thank you.