I forgot to post my day 6 (Tuesday) update:
This morning her crop was empty, and throughout the day, I made sure it emptied before giving her more food. I still gave her 2 pieces of coconut oil throughout the day, because after she ate dried pellets, her crop was very hard, since she didn't drink much water.
She had a little bit of grass/ undigested grains in her poops in the morning, but in the evening there weren't any more! She also had 4 cecal poops today, which is good.
I offered her the Epsom Salt water in the morning, and she drank a little. But decided to give her plain water later because I read that too much Epsom Salt will cause dehydration.
In the afternoon, I let her hang out in the run, and she ate some dried grains, and had a very long dust bath. She also jumped my black australorp. She is the alpha hen, so maybe she's re-establishing her place. Then I took her back in the evening to limit her food intake, and give her only pellets.
Hopefully she's able to digest the grains. She ate some grit, so I think she will be okay.
Final update (Thursday): Yesterday (Wednesday), she was free in the run with others (crop was empty that morning), and this morning, her crop was empty again. haven't let her free range yet. She's definitely eating slower now, which is good that she learned that. But she's very picky about foods now, even refusing yogurt and mealworms. She still has some undigested grains in her poop, once in a while, but I caught her eating grit this morning, so that should help. She hasn't laid yet either. Also giving her (along with everyone) light garlic water, herbs, and spices, to prevent any yeast from growing.
Overall, I think the coconut oil and massages worked slow but also the best because it was the most natural. I didn't give too much coconut oil, just enough that her crop is very soft and pliable, and that I could see her pooping it out, because when she had too much coconut oil, she didn't want to drink water.
I used 50 mg stool softener once, and it caused her to have diarrhea and less appetite afterwards, and didn't seem to speed things up too much. but if she wasn't good by day 5, I was going to use more.
and the molasses flush worked well, to flush her intestines out, but not so much on the crop.
Just a lot of time, to slowly let her pass everything, while making sure she doesn't eat anything indigestible in the meantime.