Thank you for writing to us.
I am sorry to know that your mother is going through a hard time.
in a person who has been a diabetic for more than a decade and a half could be due to what is called as "autonomic neuropathy", which is a condition in which the nerves coming to the gut do not function very well and are damaged by long-standing diabetes
To overcome this problem she needs to make a few changes in the diet.
She should take a diet that is high in fiber with lots of fluids.
A high fiber diet would include things such as:
Whole grain cereals
Over the counter fiber supplements like isphaghula husk or metamucil
In addition to the diet there are medications that can help by softening the stool which include:
Milk of magnesia
Sulfolax drops (skilax drops)
Additionally the blood glucose should be kept under control and she should drink lots of fluids as well.