Are there any herbal remedies for spinal stenosis?

my 93 yr old mom has a "dead" feeling in her lower legs, she was always pretty active up and till 3 yrs ago, she suffered a mild stroke, then got the shingles on her face, and the combination of the two illnesses really made her come to a halt..physical theraphy doesn't help, it's too painful, her main complaint is the dead feeling in her leg muscles and her lower back feels weak she says...