Sinead is such a poignant person. I'm not saying that in a bad way. She is a woman who sky rocketed to fame on more or less one song. She clearly was more than that, but that's what we know of her.(SNL scandal aside).
She was eaten up and chewed out by the record industry. You can hear how jaded she is in this letter. It's truly truly a sad thing. The same thing will happen to Miley, that happened to Britney, that happened to Simpson, that happened to every pretty face with a top rate music producer and company backing her. They play up their innocence, build up their sexuality, let it implode, reap in the PR, exploit it for profit, and dump them.
I personally found this article very interesting, not for the fact that she was giving advice, but for the insight it provides of a woman who was at once fuel for the machine.