Sick ISA Brown hen

[liltexred]

Hey, y'all. So, my hen Miss Blue is a 3yo ISA Brown. About a month ago she had an impacted crop. We fixed that and she went back out after a few days. Then she got a sour crop. We fixed that and she went back out after a few days. The next day, my husband saw her laying on the ground in the chicken yard with our rooster standing on top of her. We brought her inside. She's not impacted, she's not sour, she doesn't have water belly, there's no egg stuck anywhere inside. I've tried warm baths, used Recovery 911, gave Corid for 7 days, then vitamins for the last 3, but she's still not well. She won't drink much and she's not eating no matter what I try to give her. I let her roam the house and she mostly walks around for a few min, then sleeping standing up, over and over. I am at the end of my whits and not sure what else can be done or if she's maybe just slowly passing, and if so, should I help her go? I'm so scared to help her go bc what if I just haven't found what's wrong yet? I have no idea what to do. She is an ISA Brown and I know they don't have long lives, but I love my feathered babies so much. Thank you in advance!!