Sorry to hear this. It's always a bit dramatic when it gets to the acute stage.
I've been told and have found that sour crop, being fungal in nature, doesn't improve with antibiotics, in fact, they can have the opposite effect by removing some of the natural flora that exists in the crop.
The way I have got past this is to make sure she has plenty of water and that you massage her about four times a day for at least 5 minutes each time. I have drained crops in the past but it's unpleasant for the chicken and it's as scary as hell for us! So I work on this basis of regular massage withholding food for most of the day if not all, and letting it work its way through.
Sometimes sauerkraut is the symptom of another problem that is in the digestive tract somewhere. You are right in looking for worms and treating because that can cause it. However, it can also be caused by foreign objects or some other form of obstruction, such as ascites. Some people will say that if that is the case, you can use molasses to flush through the digestive system however, I've never needed to do this myself.
One last thing worth mentioning, is I would be trying to give her some probiotics to help restore the natural flora that may have been lost due to the antibiotic.
I wish you luck, but again the best thing that has ever worked for me, is regular massage throughout the day for 5 minutes or more at a time.