That neck dance maybe her way of adjusting her crop after eating.
The stress is adding to the lack of sleep ... You need to take care of YOURSELF :hugs
I'm trying to figure out why is the "crop" area so "red" ... There's like a "raw" spot in the 1st picture, was it pecked? You need to prepare your daughter for the worst & hope for the best. It's all part of raising animals & the circle of life :hugs
Do as @azygous advised ... Boiled egg yolk is mixed with feed, moisten to make a mash. Tofu is great too, mash it up, you can also mix the Nutri Drench with all of the above. In a bind, heating pad works or even an incandescent light bulb (40 - 60watt) in a clamp on reflector.
Possible as...