Sounds like her crop is probably normal, but just in case, check it first thing in the morning before she eats or drinks anything. Take away all food and water tonight so you know when you feel her crop tomorrow morning, you know she hasn't had access to anything. If it is full, here is a good article on sour and impacted crops...
https://www.backyardchickens.com/a/impacted-slow-and-sour-crops-prevention-and-treatments
Good job on the egg check.
I would get her wormed as soon as possible. Worms kill them quick if you haven't done so in a while. And this way if she is still sick in days to come, you can rule out the worms.
I would get a good wormer. Something like Safeguard Liquid Goat Wormer. This stuff will take care of most worms. If you can't find the liquid, the Equine equivalent of Paste will work. In the future, you might keep some Valbazen on hand which kills all worms. If you have a TSC nearby you should be able to get the Goat Wormer in the horse section.
If the wormer doesn't fix her up, she could have some bacterial infection going on. I would try the worming first before going the antibacterial route just yet.