Thought I would update everyone on this hen....I ended up culling her and saying she must have been caught by a predator. She had started biting me..in one way I don't blame her - I would bite too being locked in a dog kennel - but in another, if she was half decent she could have been loose.
The lady was a bit upset, but not overly so.
Well, at least your problem is solved. Good to hear.