I'm sorry your hen is not well.
I too would suspect she's got a crop issue since it feels like memory foam (doughy maybe?). Likely the crop issue is a symptom of an underlying condition since she doesn't lay eggs anymore.
Read the article below for crop treatments - I have used these methods several times, so yes, these are products/methods I would personally use.
I would first start by giving the coconut oil, lightly massage the crop and see if you can manipulate it a bit, a doughy (memory foam?) crop can also be sour or turn sour quickly. If she's not pooping well, I would probably give her 1 stool softener as well. Make sure it's stool softener stimulant free
not a laxative. IF the crop has not emptied by morning, then I would start her on the yeast medication. I use Clotrimazole because I found some cheap LOL Miconazole is fine too - either one works. Follow the instructions in the article, but make sure you are giving 2X a day for 7 days. Finish the yeast medication even if she drastically improves.
I have found that hens that have reproductive problems (which I'm guessing is your hen's main problem) can have crop issues due to inflammation, cancer or matter in the abdomen or the reproductive system. Sometimes I can give supportive care and the hen does do well for several months. The weight loss is concerning for sure, so I would provide her with some extra protein (chick starter, egg, fish or meat). Poultry vitamins for a couple of days to give her a jump start. Then once a week I would direct dose her with vitamins.
Hopefully she will start to feel better for a while. Sometimes there's more going on and they just are not able to bounce back. This is when I put mine down and perform a home necropsy to see if I can figure out the cause of decline. It may sound a bit morbid, but for me it's part of learning and I have been able to recognize symptoms and understand what may be happening, whether I can help or if I just need to go ahead and put a hen out of their misery.
https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/