My 84 Year Old Mother Had An Unsuccessful Hip Surgery

My 84 year old mother had an unsuccessful hip surgery (3 pins) in October and has just had a partial hip replacement this past Monday. She has COPD and is in her final stages of that terrible disease. She is in rehab and they are finding that she isn't urinating or having any bowel movements. She's on pain Meds which certainly cause constipation but I'm concerned about her not urinating....