Hello! Thanks for putting your query in HCM. I am a Gastroenterologist (DM).
After a major surgery, like your mother has undergone, constipation
may develope in post operative period. Since she has tried mirolax and movical and also senokot, I will advise to get a xray abdomen in standing position to see for Intestinal obstruction
or paralytic ileus
. If they are not there then take macrogol sachet orally by dissolving in water and may get proctoclysis enema
if not relieved
I hope I have answered your query and this will help you. Remain in touch and get-well soon.