What is that about crypto in your flock? Is that cryptosporidium, and has that been found in the upper respiratory tract or intestines? Have you had a death from that? Gabapentin is very much going to make her sleep. Are you still giving any calcium? I know you said her calcium level was normal, but it might help her egg shells or to pass any egg. You can get enrofloxacin online at Jedds.com. Some vets will prescribe it for hens with salpingitis or reproductive infection, but some will not. It treats a lot of different bacteria, and especially with reproductive infections.
The first time we had an outbreak we had like 5 inside getting treated at once, but we got them all healthy again and most did not have a relapse (they will just carry it forever). We hadn't lost one until recently, we had a severely immunocompromised hen that lived indoors, every time she had a stressful event (molting, for example) she would have a flare up and would need to be treated with sulfatrim for at least a month, metoclopramide to get her crop moving again, lots of tube feedings, etc. Vet said it can cause all sorts of other issues, including reproductive tract issues and neurological issues. He's never prescribed enrofloxacin, I can ask him about it - he said he is treating this like a salpingitis case. She is getting nutridrench which says it has calcium in it, I did try to sprinkle some calcium on her food but she wasn't interested. I had read this page: 