There are 3 ways to do feedings. the bolus method is fast and can cause problems with bloating, diarrhea and stomach upset. Since your mother already has issues with this, the bolus method may not work. Next is gravity which is a bit slower but still faster than when using the feeding pump. Same issues will exist.

I am unable to do either the gravity or bolus methods. I have tied several times and with several different formulas. So I use the feeding pump. While I would really like to use the other methods, this wont work for me. Maybe your mother has the same sensitive digestive system and will need to use the pump. Ive used a feeding tube for several years so I know all the little tricks and ins and outs of doing the feedings. A nutritionist should know these things too. I have found the younger nutritionists do not have much feeding tube experience with adults.

Using the feeding pump, I add water and keep it slow. This will solve your mothers problems. Start her out by adding 2 cans of water to ever 3 cans of formula. Keep the rate very slow at first, 40 ml per hour to start. Once she tolerates this for a few days, increase it by 20 ml per hour. Do the feeding pump overnight so she sleeps thru most of the feedings. Make sure the head of her bed is propped up and that she sleeps on at least 2 pillows.