I rescued 4 ex-battery hens last December, and sadly lost one a couple of weeks ago. Unfortunately, one of the remaining 3 has been looking unwell for a couple of days. It started with her laying an egg with no shell, after which she has not been her usual self at all. At the moment, she is standing on her own with her eyes closed for most of the time. As far as I can see, she is not eating. What can I do? Thanks