Juniper Potter and the Half Blood Prince

Juniper Potter's parents were murdered by Lord Voldemort sixteen years ago, she knows the Dark Lorde is rising and no one else does. But, this isn't about the Dark Lord, this is about the Half Blood Prince, the only man left standing from the Marauder Era, and his past.
(This story is based off of the Harry Potter series. But the twist is that Harry is a girl)