The Life Before Her Eyes by Laura Kasischke (I love the audio cover and paperback cover.)
Diana stands before the mirror preening with her best friend, Maureen. Suddenly, a classmate enters holding a gun, and Diana sees her life dance before her eyes. In a moment the future she was just imagining--a doting wife and mother at the age of forty--is sealed by a horrific decision she is forced to make. In prose infused with the dramatically feminine sensuality of spring, we experience seventeen-year-old Diana's uncertain steps into womanhood--her awkward, heated forays into sex; her fresh, fragile construction of an identity. Together with the sights and sounds of renewal, we experience the tasks of Diana's adulthood: protecting her beloved daughter and holding onto her successful husband.
An acclaimed writer and poet, Laura Kasischke has crafted a consciousness that encompasses the truth of a teenager's world and the profound transformation of that world at midlife. Resonant and deeply stirring, The Life Before Her Eyes finds piercing beauty in the midst of a nightmare from long ago that echoes like a dirge beneath each new spring.
There is also a movie adaptation starring Uma Thurman.
I watched it recently. A little confusing but interesting too.