Who is Rarity?

This a story about a girl who didn't have a mother. One day she had a dream and a fairy appears and asked her any wish, and she'll grant it.
Rarity asked if she could get her mother.
The fairy gave her a book.
When she woke up she found the book.
She opened it and ended up in a different world.
Will she find her mother?
Join her on her adventure!