What is wrong with my daughter?

My daughter is very quiet and soft spoken. She also likes to read a lot. On the weekends, she sometimes stays in her bed all day, curled in a ball reading her Kindle. She also likes to sit on the couch, wrapped up in a blanket, reading. During the week she always starts reading after she's done her homework and reads late into the night. When we go on vacation, the only things she does on the plane are read and sleep. And when we go to the beach, she lays on the beach towel and reads all day. She also reads very fast and routinely reads 400 page books in one sitting, and she read 190 books last year. She has friends but never wants to see them outside of school. I'm glad she isn't partying and stuff, but why does she read so much?

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