It looks to me that your mother might be having RSD. This is a disease which can cause swelling and pain and it is triggered by fracture
in hand. I would suggest you to show it to a orthopaedic surgeon
and get checked if your symptoms are matching with this disease.I also want to tell you that it is a self limiting disease and it may heal by its own in a year. During that time you need physiotherapy
, Wax bath and amytryptalin tablet daily.