Thank you for your detailed reply. I will keep that information handy. I tube fed her as she had no interest in feeding, but after 2 days of this she has deteriorated. She is now lying on her side and her tail is stiffening behind her. So I am guessing that whatever the cause of her initial behaviour, it is probably to late to save her.
I still think the initial problem may have been egg bound as there were no outer visible signs of parasites, rot or infection. She has a pearly looking bulge at her anal opening and was carrying eggs.
It is hearbreaking to see her struggle and if she survives the night I will try and euthanase her tomorrow – hoping nature takes its course before this as I think it will be difficult.
Thanks again, Lisa