Could be a lot of different things. Toxins, foreign body that’s stopping up her GI tract, etc. She definitely doesn’t look right. She looks thin, unthrifty. Probably partly because her diet hasn’t been complete.
Does she appear dehydrated even though she’s drinking a lot? (Eyes sunken, mucus membranes inside her mouth dry, that kind of thing). If not, I would be tempted to remove all edibles/drinkables for a few hours and see if her crop area empties some. Maybe she just overate all those tasty tadpoles but if she’s bringing stuff back up, things aren’t moving the way they’re supposed to. if it empties out some, then offer a small amount of water but don’t let her gorge on it. If she does ok with that, offer a little food.
I had a chicken that had a water balloon crop and I thought she had some sort of crop impaction, tried treating her, but she died and when I opened her up, she had a bunch of large rocks stuck between her crop and her gizzard. I couldn’t feel them because they weren’t still in the crop!
When you do offer food, have you tried soaking the crumbles/pellets with warm water? Sometimes that’s more palatable to them than boring, hard pellets. If you have something that she normally loves to eat, you can put a tiny amount on top of the soaked feed to try to entice her.