Hi Quest, first of all, is she on anything pharmaceutical for osteoporosis? Many of the standard "osteo medications" themselves are what causes bone pain. I ask this because my MIL is 81, on bisphosphonates for at least 4 years, and some days she's in so much discomfort that she can barely get down the stairs. (of course, her doctor would never think of linking this to the bisphosphonates

and she won't listen to us when we tell her to stop taking that poison)
Has your Mom sustained vertebral fractures, and is this the source of the pain? If she has no history of fractures, where is she feeling the pain(i.e. is it bone or muscle?)
Perhaps if you can provide a bit more info, one of us may have some insight for you. For now, if the pain seems to be related to a medication she's taking, my advice would be to discontinue it.