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They are correct that it will typically take several more days for these wounds to heal after the tubes are removed and that protein intake is the most important nutritional component to promote healing, and there is no supplement that can substitute for protein intake. If she is not getting a good amount of protein in her diet, then the next option would be to get some protein powder and add it to whatever food is well tolerated. Protein powder is frequently sold as something to be added to smoothies, but can be added to other foods. A multivitamin supplement can also help promote healing in someone with poor oral intake.
It also may help to apply a minor pressure dressing to the wound by folding one gauze pad into quarters and covering with a second unfolded gauze pad. If she finds it uncomfortable to tape these in place, then using an elastic bandage, such as an ACE bandage, to wrap the entire abdomen would be an alternative. If using this, you would not want it so tight that it constricts breathing. It should just be form enough to hold the gauze pads firmly in place. Depending upon the exact location of the wound, it may also be possible to hold the gauze pads in place using a back brace.
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