Firstly, sorry I havent updated this post, I have been away withe horse showing and only got back yesterday.
So, the ewe is looking much better, she is standing well but tending to lie down when in the pen. I have cornered off a small area for her to stand and graze. She does want to stand but it takes her a minute to get her balance. Her feet look fine, no rot or anything, I think she went into pregnancy toxima then gave up trying to stand. I have no idea about the experience of the vet, nor was I present when she made her diagnosis so I really cant speculate on her knowledge. I am treating the ewe with her meds and I think she is much improving, though I am feeding the lamb for her.
Hopefully she will improve enough (along with the weather) that I can get her out during the day at least.