I called a vet and they said to give her a medicine called VetRx, have you heard of it?
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This is what it looks like. I gave it to her yesterday and she actually seems better!
If she’s acting pretty normal is it likely she’ll get sick again?
It is hard to tell at this point. Some hens will have reoccurring problems. The good thing is that you are proactive. It will be easier for you to catch her behaviour early on. I would separate her for treatment so it is easy to gauge her intake of the medicine. She can see the other hens for her social wellbeing, but you need to know she is the one getting it! If she has a favourite treat you can try adding the medicine to it. As example, I can put medicines in grapes and my hen will swallow the grape whole. She gets the meds without tasting the suspicious taste.
If you can I would inspect her body closely. Look under her wings, between her feathers etc. Make sure she doesn't have any unusual lumps or ulcers. They are very good at hiding illnesses.
I have a few unique hens. One had a serious brain trauma a few years ago. She is still head chicken, but she can't preen all her feathers properly. I need to bathe her because she can't tend to her rear feathers. I also have an adorable scoliosis hen. Chickens, like people, sometimes live their lives with a uniqueness.