You mention the crop is fine-feels too hard and soft - which is it? Feel the crop at night, then first thing in the morning before she eats or drinks. The crop should be full at night and empty or flat in the morning. A crop that is hard/not emptying, that is boggy or that still has food in it in the morning is not functioning properly. Here's some info for you https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/ Since your vet doesn't see chickens, the best thing to do is send a sample to your NY state vet lab for testing -they do perform testing for poultry. Here is the contact information-give them a call or visit their website for more information. Animal Health Diagnostic Center https://ahdc.vet.cornell.edu/programs/avian/contact.cfm Phone: (607) 253-3900 Fax: (607) 253-3943 Hopefully you can get her eating and drinking, have some testing performed and find out what's wrong with her. Good Luck! You can find poultry vitamins at most feed stores or you can order online. Any of these will be fine to add to your sick hen's feed or water for a couple of days, then once a week thereafter.