It's not a completely hopeless cause. People (fans) have been able to contact her in the past and even got her real address to send her stuff (such as that garbage can that someone sent to her from Rose of Versailles and the desert sand.)

I don't believe that she'd have the time or even the will to read all of her letters (although I think that sometime in the past blog she said that she does..)

But send it anyway - you never know. I've been meaning to email her .. but I don't know. It doesn't seem to be worth the effort somehow. I'm not even sure that it goes through: the format's all in Japanese and so if it were an error on the recieve end, I'd never be able to read the hirigana to understand.