Eek! "Only one?" she asks wringing her hands.
(So this is how I will cheat.)
When is was 13, I would have said, Jane Eyre.
When I was 16, I would have said, Look Homeward, Angel or The Eighth Day.
When I was 18, I would have said, Franny and Zooey.
At 21...? Flannery O'Connor. Everything.
At the grand old age of 30, sheesh...I've gone back to classic young adult literature. I lo-ove The Dark is Rising. Susan Cooper rocks!
But, hey, reading should be a pleasure. I often mix my Bridget Jones' with a Cormac McCarthy. If this is to help a 17 year old ready herself for university, she should just be encouraged to read. Anything. (I think Franny and Zooey really spoke to the college "me.")
P.S. My husband says, hands down, Anna Karenina...Nope, changed his mind. The Unbearable Lightness of Being.