Where The Moon Shines

A young girl who was raised in a cell, doesn't really know it. She lives in a big enough room to be a little house. She has everything she needs. She doesn't know of any other people, or any kind of living thing. Expect for a tall dark figure that never shows his face. He only comes to bring fresh food, or fix something thats been broken, or something new for the girl to enjoy.
She does have a little companion, he's a mini dragon named London. The name came to her as if the word meant something deep to her...
The only outside of her room that she knows is the moon that shines right outside her door.
She doesn't know what daylight is, cause the tall dark figure shuts everything tight outside her room. But she has no clue.
This life she has is so normal to her.
Why is she living it though?