This is what happened to mine when she had impacted crop and a bacterial infection. Is her crop emptying? When you massage it, does she smell like rotting matter? If so, follow miss prissy's advice for impacted crop
Put her by herself in a warm, dim, quiet place.
Do not give her any food for the next 8 - 12 hours. Make sure there is no bedding that she can eat. Only give her water with raw organic apple cider vinegar.
If you have to give it by beak with a syringe yourself to get her drink do so, carefully. The ACV helps to kill any bacteria, yeast, fungus or virus nasties from growing in the crop.
Very gently without pushing upward massage her crop once an hour.
At the end of this period begin feeding her bits of bread soaked in olive oil. Make sure she also has lots of water.
For the next 24 hours only the olive oil bread and water.
Once an hour gently massage her crop and see if anything is loosening and trying to move through.
With only bread soaked oil you should start to see some significat poops. Keep her bedding clean and don't use anything for bedding that she might eat.
If the crop has significantly began to empty you can give her some bits of cooked rice and a little yogurt. You can also give some water softened pellets/crumbles made mushy. A small bit of scrambled eggs will help her too with added protein.
I did the following for mine:
I tried olive oil and apple cider vinegar with the mother and massage for a couple of days. This didn't work.
We did surgery. and gave her an anti-fungal ( Nystatin oral suspension, 1.5 ml, twice a day) and anti-biotic (we used a human one, which may or may not have been good, keflex, but my grandpa who did the surgery is a human vet.) She seemed to eat the hand-fed baby bird food called kaybee which you mix with water and feed with a dropper. also ate mash of cooked egg yolk, sifted lay mash to get out the big chunks, some unflavored yogurt, olive oil, and some fine sand. I gave her droppers full of olive oil and massaged after it wasn't painful for her. I also gave her a visitor after a week because she was lonely. I hope this helps and you have good luck.
This could be an infection though.
I hope she does better.