My mother had ovarian cancer and had a G/J tube with a weight on the jejunum end that just allowed it to natural gravitate by the digestive process into the jejunum. When she pulled her tube out in the middle of the night getting it caught as she was going to the bathroom they put one in that was much smaller in diameter and although they told us not to put crushed meds in, the nurse told us to go ahead and do it anyway. It got clogged the second night and the nurses actually called Senior Protective Services on me. That was a wild time. The key is to flush daily and we even got it to unclog with cranberry juice and saved the Coke as a last resort. The night before we were going to the Bahamas the water valve leaked and the tube came out and the doctor told me to put it back in but also told me it will get infected so enjoy the trip and deal with it when we got back home. If your mom has a G/J tube it needs to be switched out in a sterile environment like an OR. If it is just a Peg tube it can be done in an office.

To answer your specific question, you can feed through the gastric tub provided you are not using the formula intended to be feed directly to the jejunum as it is partially digested (to oversimplify the discussion) and not the same as Ensure. Likewise you could not put Ensure into the jejunal tube as it will cause a lot of digestive discomfort. Get her to the doctor to be safe.

Ed