Victor M. Santiago-Noa, MD
Please do make sure that your mother has had a thorough medical examination to ensure that all of her symptoms have been addressed by her physician. In the course of that process, her medical doctor can be your ally in trying to figure out whether this is more of an emotional condition and can make referrals accordingly. You don't need to figure it out by yourself.
Also, consider her seeing a psychologist who deals with Obsessive Compulsive Disorder issues.