HELP My Chicken is pooping undigested grass and grains with soooo much water. Her crop is not emptyi

So I noticed on Friday that my chickens crop was very full. Saturday morning before she ate anything I checked her crop it was soooo big so I brought her in the house and gave her water only thinking that she had eaten a lot of grass and to help brake it up. Within two days I got it to go from about a tennis ball to about a golf ball. I started feeding her soft food wet chicken food, cucumbers, yogurt, and chicken food mass. I have given her olive oil with bread. Everything. So I took her to the vet Monday. The vet said she thought she just had some grass in there that she needs to work out. Her poop changes from mostly water/all water to lots bits of undigested food to full diarrhea. I have called the vet they don't know anything and they are not helpful! Should I give her a stool softener? She is acting fine but has been in the house since Saturday. She hates it. I ordered a chicken bra that is not here yet. I massage her crop give her electrolytes and probiotics as well as apple cider vinegar. Also, it is cold outside like cold and now I don't know how to transition her to the cold after being in the house for so long! Please Help Help Help Help!