How does Shiro get into the Deadman Wonderland? We know that Deadman Wonderland is a brutal prison for convicted criminals.

And at various points in the show, it is revealed how each of the main characters ended up there. (what crime they were convicted of)

But how did Shiro get there? Is it ever revealed what Shiro did to end up in that prison?



We know that Shiro was Ganta's childhood friend. So that means that she started off outside in the normal world. But are there any clues to what brought her into Deadman Wonderland?
Even though Shiro and Ganta were childhood friends, 


  Shiro was used in experiments by the director (Hagire Rinichiro) and Ganta's mother. This was all before Deadman Wonderland was created, and when the director founded it, he created a special room for Shiro. Shiro wasn't imprisoned there, but lived there so that the experiments to create the "Wretched Egg" (Shiro's other personality) can continue, thus she was brought there by the director when Deadman Wonderland was created.


This was mentioned briefly in the Deadman Wonderland wiki.