How lovely that your mother knows about the Alexander Technique. I'm sure it does her a world of good. I know well, as I'm a certified teacher of the Technique, have been involved with it for more than 30 years, three of those years in teacher-training school in San Francisco. Do you know which teacher or teachers your mother studied with?
I wish I could remember the name of her teacher - she's told me several times, but I can't dredge it up right off hand.