Well, I gave her backside a wash in warm salty water but couldn't get all the mucky bits off. There certainly wasn't an egg stuck.
She didn't seem to mind being poked about. I put honey on the protruding bits and then pushed them back in.
To be honest it wasn't as difficult or horrible as I expected. I have put her in a cardboard box in the stable and will check on her tomorrow morning.
Assuming she looks ok when can she join the other girls?
Sally