The Avengers' Recruits

For all the Marvel lovers out there: This is an Avenger's fanfiction like no other. I promise.
Elizabeth Barton is Clint Barton's (Hawkeye) younger sister. At eight years old, she was kidnapped and used for an experiment that was supposed to model the serum that made Captain America so awesome, except with a few alterations. At nine, she was finally rescued by her brother. At sixteen, she became and Avenger.