Hi welcome to Health care magic forum. Your mother got operated for chole lithiasis,and again for pancreatitis, either the disease or the manipulation of pancreas has resulted in diabetis due to lack of islets of longerhans cells in pancreas.Many of the anti diabetic drugs act by stimulating the cells in pancreas. As the cells are not in a position to be activated insulin injection is only remedy for diabetis in her case.
So first of all she should be convinced to take insulin then consult a diabetologist, or endocrinologist for treatment. There are new methods for giving insulin , just by a prick the metered dose of the drug is delivered to the site.Once the diabetis is under controle , everything will be fine. No cough and fever nor infection of the stitches etc.
As an alternative medicines some people experienced taking juices of vegetables only all the time. If she feels not applicabe she can take it twice ina day besides routine diet. As well she should restrict taking calories, she is advised to take green leafy vegetables, pulses, sprouts, milk, meat, egg , chicken, and dry fruits. to improve blood, general health, resistance, and stamina necessary to maintain normal life. Wishing for a quick and continued recovery and thanks for calling.