I’m interested in spinal stenosis and spondylitis and is it the same as AS

My Mom has had stenosis for at least 20 years. She has some discomfort upon waking in the morning and uses walking aids throughout day. She has experienced “flares” about twice a year, with it she has extreme pain for approximately 7-10 days. The last flare was torture-very little relief with twice daily hydrocodone. The most recent CT scan revealed severe multi-level lumbar degenerative disc disease/malalignment and mild lumbar dextroscoliosis, most pronounced at L4-L5 indicating severe central spine stenosis. L3-L4 right central disc extrusion and progression of L2-L3 degenerative disc disease. Severe chronic bilateral sacroilititis.