Glad your sister got what she needed with the IV in the ER. Poor thing probably felt horrible. Such a darn shame when someone is going thru so much at a young age. She should recover much quicker than someone older in the same situation.

Here is a high calorie chocolate milk shake recipe I made up while I was doing my radiation treatments. Each shake is well over 2000 calories each. They are huge but really good. They should go down easily too.

(All measurements are estimates)

Giant High Calorie Choc-Peanut Butter Milkshake

3 or 4 cups chocolate ice cream (regular/full fat type)
2 tablespoons peanut butter (smooth type)
2 tablespoons chocolate syrup
1 or 2 cups whole milk (can substitute half and half to add even more calories)
1 scoop carnation instant breakfast
1 scoop high protein whey powder

Blend this extra long to make it very smooth and creamy so it goes down easier.

Another thing that should help is the List of Easy to Eat Foods.

Best wishes with everything!