It sounds like she may be having a problem with her crop, since it was 4x normal when you found her after returning, and she had lost a lot of weight. Frequently crop issues can be related to reproductive disorders, water belly, or cancer. You can try to check the crop each morning to see if it is emptying normally overnight. This article by azygous is very good to figure out how to help her:
https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/
If she seems to be suffering or not responding to treatment, I would consider putting her down. I have lost several birds over the years whose crop problems never got better. They can suffer a lot. Let us know how she gets along.
https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/
If she seems to be suffering or not responding to treatment, I would consider putting her down. I have lost several birds over the years whose crop problems never got better. They can suffer a lot. Let us know how she gets along.