My little one is slowly on the up from this too. Re food to help build her up..
This afternoon my little one ate her and my portion of a smoked salmon carbonara...(basically I am trying to feed her the most delicious food I can think of that fits within her limited range of ok food).
So she got pasta smothered in a sauce made of beurre noisette/cream cheese/grated parmasan and smoked salmon (with a little water to loosen the sauce). I had intended to eat half of what i made, but have had to make do with her leftovers. I also didnt bother with adding veggies to the sauce today, focusing on increased calorific intake instead. She also looks awful: pale, skinny, sunken eyes..though she did seem in a much better mood after lunch.
My only concern is expectation management..
I so know she is going to be expecting similar cuisine when she's better.. tantrums ahead.