Hi Dayna
I have this list i created for another member but unfortunately they are UK foods and i don't know if any of these they are available in the US.
Regarding calories kitten food is usually high in calories, boiled eggs are ok, low in carbs and low in phosphorus and the white is high in protein which is good for building up muscle but they are also low in calories.
You will need to know her weight so you can calculate her daily calorific needs and to see if she's gaining weight, also you will need to weigh her weekly to check her progress.
I have found these Fancy Feast foods that are quite high in calories.
This has 96 cals per can and is only 5% carbs
https://www.purina.com/fancy-feast/wet-cat-food/timeless-favorites-classic-pate-chicken-senior-food
This Kitten food has 96 cals per can and is only 4% carbs.
https://www.purina.com/fancy-feast/wet-cat-food/classic-pate-turkey-kitten-food
Ideally you need foods that are in the 90/100 cals per 85 gram cans and low in carbs, there looks to be a few on the purina site.
I use this carb calculator.
https://secure.balanceit.com/tools/_gaconverter/index.php
They say that a healthy cat should eat about 20 calories per pound of body weight or more if weight gain is needed, so again you will need to know her weight, sorry.
I don't know what her BG is as you don't have a spreadsheet set up but if it's high then her body will be struggling to absorb the nutrients from the food.
High numbers will stop any nutrients being absorbed into her body resulting in weight loss, insulin acts like a key opening the cells in her body so the food can be absorbed.
You are doing the right thing by giving her more food, try giving her more at pre-shot and more at her mini feeds if she will eat it.
Is this the food you are feeding at the moment?
https://www.purina.com/fancy-feast/wet-cat-food/timeless-favorites-classic-pate-chicken