Is her crop emptying overnight?
If her abdomen is bloated, then she may have a reproductive disorder. Fluid or a mass could be pressing on nerves causing some of her symptoms. Very hard to know unless you lose her and have a necropsy.
For a bird that has a neck that's twisted like that, you...
Has she been laying eggs since she molted?
The neck turning is a neurological symptom, you can try offering supportive vitamin therapy of 400IU Vitamin E and 1/4 tablet B-Complex daily to see if that helps.
Offer some egg as a daily treat, this will help with the uptake of E.
Do you feel any...