After giving my twelve year old niece (she'll be thirteen in May) a $10 B&N gift card for Christmas, my sister-in-law turned to me and said, "I'm glad you are encouraging her to read, but I had hoped you would start introducing her to some of the real classics. I know that you could pick out better things for her to read."
No pressure, right?
My mind immediately began whirling with all of the great books I could buy for her! Great works of literature! The classics of science fiction! But the trouble is this: I'm a thirty-one year old man with a five year old daughter. I have never had to worry about what would be appropriate for (or of interest to) a thirteen year old girl!
I'm hoping that you all can help me out. What books would you buy for a thirteen year old girl? What books do you wish someone had bought for you to read at that age? What would be thought-provoking and essential, but engaging and age-appropriate?
No pressure, right?
My mind immediately began whirling with all of the great books I could buy for her! Great works of literature! The classics of science fiction! But the trouble is this: I'm a thirty-one year old man with a five year old daughter. I have never had to worry about what would be appropriate for (or of interest to) a thirteen year old girl!

I'm hoping that you all can help me out. What books would you buy for a thirteen year old girl? What books do you wish someone had bought for you to read at that age? What would be thought-provoking and essential, but engaging and age-appropriate?