Sorry to hear your mother is having problems. Hunching of the upper back and shoulders in the absence of a trauma is almost always due to poor posture and abnormal head forward carriage. This can result from chronic pain and pain avoidance behaviors, weak postural muscles, or bad habits. A chiropractor can analyze her posture and identify any abnormal motion segments of the spine and suggest posture correction exercises and appropriate adjustment to restore normal motion to the "stuck" or fixated segments. This will take active participation on her part maintaining a regular stretching and exercise program in addition to the chiropractic care recommended.
J.L.Harris, DC, DABCO