Whispers

Clarissa Black has always lived a normal wizard life, with her twin brother Sirius. She lived eleven years at Grimmauld Place, creating a shell that honestly, wasn't hard to be broken. "Pureblood" this and "pureblood" that, muggles are dangerous, Slytherin is best. But when she goes to Hogwarts, something happens that changes her future. The sorting breaks that shell with only words.
Too fair and loyal for Slytherin, but Hufflepuff will do you no good. You have that one extra trait that usually makes me send you students to. . .
She becomes best friends with Lily Evans, the twins Marla and Rose Potter, and Melody Rivers. The marauders are always one step away. But then things change. Dark secrets are uncovered. She soon has to share the secret, and learns to fear an everyday thing. She starts hearing whispers, always close to inaudible, always uncertain of what they say. Do they mean anything?

Discontinued, but little snippets of what happens in the future are at the end.