The library had been long forgotten. A hospital built on top of it, on purpose or not. In the library, there is this one special book, it had been enchanted. If you read the text, you are forever changed. This is what happens to the girl.
I just recently started to write stories directly towards the FiM actively, though I have been writing for years, publishing numerous stories at Mibba and the eventual pony story, as far as to the MLP