Sam went to bed with the chickens, as his mum would have put it, and as he did he saw a lovely little lady standing right in the middle of his room, all lit up like a lamp she was, and he would have sworn she had wings, although he actually didn't see any such.
Samwise, she said in her silvery little voice, you must go next door. I must leave him now. That Thing he carries is too much for me any more. You will know soon what you must do.
And before he could say boo, she vanished, just like that, and he jumped up, yanked on his clothes, and fairly jumped out his window. Dashing over to the Bagginses, he heard voices, and went to peek in a window. And could not believe what he saw. And heard.
You will do what I can no longer, Petal thought sadly.