Just thought I'd share my experience Sally. Our ewe, Iolanthe, had a vaginal prolapse, quite a substantial one, on her first lambing, a couple of years ago. It appeared a couple of weeks before she was due and we used a harness and spoon for the duration until she showed definate signs of labour. We were terrified of removing it in case everything spilled out in a massive way. OH had the experience all to himself in the wee small hours and bravely took all the contraption off/out and she lambed fine and reared beautifully. We gave her a year out from lambing and observed her with a little trepidation this year as she went through pregnancy again. She had not a hint of prolapse this year. You'll have to be careful to keep the balance right on feeding your girl prior to lambing as it's a well known fact that overweight ewes can be more prone to prolapses, but I'd say she's worth another go after a year out.