What do you think Buffy wrote in her letter to Joyce at the end of Becoming, part 2?

[itssmiletime]

This has been on my mind recently. I mean, its never been fully established, but I am curious to see what other people think Buffy might've written. All I know is that Joyce cried when she read the letter, and expressed alot of worry about her whereabouts and her safety in Dead Man's Party.