So sorry to hear your awful news. Our last girl went the exact same way. She hadnt laid in a few weeks and was back and forth to the vet as she was loosing weight too. She started to improve and even laid us an egg. We were so pleased and relieved our girl was getting back to her usual self. Next morning, like you, there she was still in the house, had a look, looked happy but then saw a massive blooming messy prolapse. She had to be PTS straight away and rushed her to the vets. They told us, it usually goes that way, just when you think they have turned the corner, something awful happens and there is "NOTHING" you can do about it. Please remember the good times you had with her hun, same as we do with our lost lil girl. You made her so happy and thats what matters most of all. What a great life you both had.