You somehow believe the woman but you want to know more about these dimensions before you agree to anything.
From Create Your Own Story
"Are you saying that there is a world where Hogwarts, Narnia and Middle Earth Exist?"
"Yes," Fate replies.
"Well then I want to go to one of those worlds, I don't want to go to Forks!"
"I'm afraid that is not possible because you love those worlds and if you like a world too much you may stray from the destined path and cause changes to Canon. This is also why you were chosen to fix Twilight; you don't like it or hate it enough to want to change it." she said.
Fate made no sense but you agreed begrudgingly to go to Twilight. It may be fun to live in a different world.
Fate smiles with relief, "Remember, you must not let anyone know you are from another world and you must not change any event otherwise the consequences will be horrible. Your main goal is to get Edward and Bella together without making major changes to the story; good luck!"
After that you wake up but realize you're not in your room. In fact, you are in a forest surrounded by trees.