? you have to consume fat, which has 9 calories per gram, carbohydrate, which has 4, or protein, which has 4. It does not matter which one. There is no other way, and this is the only way. What exactly is the question? If you are looking for a recipe, you would still have to make some of it and see how much she actually consumes, which will depend on her flavor preferences and your talent as a chef. Obviously some factors like more calories per unit volume may be helpful. Either buy high calorie shakes, or make a concoction that tries to mimick them, for which there are many recipes on the internet.

Better advice is to understand the problem and do what makes sense. The main problem with adequate intake in such a situation is nausea or lack of appetite, not anything to do with the composition of the food available. Frankly the medications that help with that are dimenhydrinate, and THC is actually one of the best anti emetics around.

The best ingredient to solve your problem may be either gravol or weed, but it depends greatly on the realities you are actually dealing with, which could range across a whole spectrum.