Suggest A Remedy For Severe Back Pain Due To Spinal Stenosis

My mom is a 86 year old woman...mild dementia...chronic back pain caused by severe spinal stenosis... She is about 4'11" and 130 pounds... She is in temporary hospice care until they can figure out the proper doses to control chronic leg and back pain. They just put her on liquid moraphine, has a 75 mg Fentanyl patch, and she is also on a small dose of Neurontin. All that is combined with all her other meds for high blood pressure, hyper-tyroid, dementia and a few other ailments. My question is, what I've been somewhat afraid to ask is, with all this going on, does she have much longer to live?