You will never find satoshi unless she wants to be found. Period.
I don't think Satoshi Nakamoto is a girl.
I found so many posts here from people quoting their discussion with Nakamoto. And from what i learned, satoshi is a male. I don't really know why he vanished, but i guess some guys on the forum have the answers (@hilarious @theymo)
But even if someone manages to get the ID of satoshi and if he is still alive, what would be the benefit ? The actual core team is capable to handle the development of Bitcoin, and i think that it is the most important point.
Let Nakamoto rest in peace if he is dead, or live his life if he is alive. I am sure that he had his reasons for leaving and i remember someone posted something about this, where he was going to reveal a key information before vanishing, a member of the forum reported this information last year, but i can't find the post.