Sorry you're dealing with this!!
What are the other symtomps?
Is she alert? can she stand?
What is the last time she laid an egg?

What are the other symtomps?
Is she alert? can she stand?
What is the last time she laid an egg?
In my opinion, and in my direct experience, these very very bad cases of sour crop are often associated to other issues (often reproductive issues), that often are incurable. So please, don't blame yourself 