Sour Crop? Pendulous crop? Help please

[Gotalotofpetstoo]

I need help figuring out how to help my girl. Mae Is a 9-year-old blind house chicken. We have had her in the house since she went blind over a year ago. We tube feed her and give her her vitamins and supplements and she has done very well on that. She did eat on her own for a short time but she stopped so we went back to tube feeding. Within the last 7 to 10 days we noticed her crop wasn't emptying completely at night. So when we got up the next morning to feed her, we only gave her a small amount. I feel like her crop is not emptying at all at this point. She still won't eat food, even worms, but she is drinking water. Her crop is of course soft since she's on a liquid diet and is about the size to fit in the palm of my hand, just the palm, not including my fingers. We have withheld food since Sunday night. I have tried massaging her crop with no improvement. I can't imagine how she could have anything in her crop to cause a blockage since she is on a liquid diet. She does get her pills morning and night But she has never had trouble taking those and I imagine if they're sitting in her crop for some reason they would have dissolved by now. We did try the crop bra but she would not tolerate it. She fell over and flailed around so I had to take it off. I tried it again the next day but got the same reaction. I don't know what to do at this point and I don't want to lose her. One thing I have noticed in the last few weeks is that when she is laying down breathing, she somewhat rocks forward and back forward and back. She is not mouth breathing and doesn't seem to be having any issues with her breathing. Part of her diet is a few drops of vet RX at each feeding. Since she has not been fed since Sunday night, she is getting the drops directly in her mouth. One last thing that I have also noticed is that her feathers seem to be more fluffed up. What can I do to help her?
Also, she does wear a diaper from crazy k farm during the day and off at night. Could that have anything to do with her crop not emptying properly the way the straps come up under her wings?