Thanks for the reply
@Blue_Raptor! I do have some questions if you don't mind.
Ok. I've already been massaging her crop.
I can't separate her right now due to weather and stuff, but Spring is coming, so if she's still dealing with this then, I might be able to separate her then. As far as plenty of water, I've been noticing this is what appears to be causing her to throw up. At night, I take away both food (so Jewels can hopefully empty her crop) and water (water because it'll freeze). When I bring in the food and water, my flock all go for the grain except for Jewels. She goes for the water. She'll refuse to eat any grain. I can't even trick her into eating her grain. Then, she'll drink so much water that she'll start spitting up. I've been wondering if it's Sour Crop, or if she's just drinking way too much water. So, as far as plenty of water, she's already doing that.
As far as all of this, do you have a recipe that I can follow? And what brand of Kefir yogurt are you using (a picture would be helpful if possible)? Is there a certain type of oatmeal that you use (rolled, steel cut, and/or quick cooking)? Also, I've heard that yogurt can lead to mucas build up, was that a problem for your hens? I probably would want to make certain that there is no added sugar in the yogurt, right? Due to sugar feeding yeast anyways?
I hope that you don't mind me asking these questions. Jewels has been doing good, except for her drinking until she spits up though. I think that massaging her crop and separating the grain at night so her crop can empty has been helping her a lot.