If it's only been 3 days with the Baytril, then don't give up.
Treat the infection. Then focus on the crop.
I'm sure you do love her very much, I do wish that she will be able to recover.
You have several threads. Is the the one that also has E. Coli infection? Doesn't sound like anything has been resolved in 8 months. You may want to research long term effects of E. Coli infection, this may be the main reason why she's not getting well or has reoccurring issues.
Culling may...
The person you quoted hasn't been on in a while, so they may not respond.
I see you have started a thread, I'll take a look and respond there.
https://www.backyardchickens.com/threads/sour-crop-and-monostat.1526255/