Remember Me? by Sophie Kinsella (2009, Mass Market)

Preowned condition When twenty-eight-year-old Lexi Smart wakes up in a London hospital, she’s in for a big surprise. Her teeth are perfect. Her body is toned. Her handbag is Vuitton. Having survived a car accident—in a Mercedes no less—Lexi has lost a big chunk of her memory, three years to be exact, and she’s about to find out just how much things have changed.