The symptoms such as painful urination suggest that your grandmother might be having Urinary tract infection
The treatment involves:
1. Drinking lots of water (it dilutes the urine & reduces the burning sensation)
2. Antibiotics depending on culture & sensitivity reports.
3. If there is associated fever
, then paracetamol
500 mg three times in a day can be added.
So, kindly consult your physician and get a proper clinical examination done.
Investigations like complete blood count
scan of abdomen & pelvis and urine microscopy & culture will be helpful.
One more thing...make sure she avoids acidic foods, carbonated drinks...& maintain good hygiene.
There is no need to worry...she will be alright after taking the course of antibiotics.
Wishing her a speedy recovery.
Thanks & take care.