Mom's confused! Help?

My mother is 60 years old. She has a laundry list of things wrong with her. She is depressed, has COPD, CHF and ESRD. She is also insulin dependent diabetic. One month ago, she broke her femur. While she was in the hospital they had her on morphine, and my mother was having hallucinations and confusion. They took her off all of the narcotics she was on, and they claimed she was fine. (I still saw a bit of confusion there, but the doctor dismissed it). She was released to a SNF for rehab and developed pneumonia a week and a half later. She was then readmitted to the hospital for treatment of the pneumonia. The confusion has come back. They have done C\T scans, tested her blood levels, O2 levels, vitamin levels and everything keeps coming back normal, except my mother. My mom has been in and out of hospitals all her life, she has never had this kind of side effect from any medication ever. Can someone give me a clue as to what might be happening here?