Hello and Welcome to ‘Ask A Doctor’ service.
I have reviewed your query and here is my advice.
Well of course is not healthy that every time she eats goes to bathroom and senna itself can be taken for
short periods.
Here are advises for your friend:
Eat healthy food with plenty of water, orange juice, apple juice.
Eat everyday: kiwi, fig jam, plum jam.
Avoid: bananas,eggs, fast food,alcohol,spicy food. Use fiber,
muesli, soup everyday. A spoon with olive oil in the morning also helps.
Try to
massage the abdomen frequently to increase the bowel movement.
Hope my advises with help you.