First off, this fic is extremely AU. Impossible. I know Harry does not have a sister. This is not a long-lost-twin kind of fic. Her name is Hannah, Hannie for short. I got inspired for this when I was reading Book 5 and Dumbledore was no longer Headmaster. I was shocked no one did anything. Hannie has red hair and green eyes and a light dusting of freckles, the spitting image of Lily. Hannie is stubborn as hell and won't give in to ANYONE. Not even Umbridge.

Hannie read aloud the notice "By Order of the Ministry of Magic, Dolores Jane Umbridge, High Inquisitor has replaced Albus Dumbledore as Head of Hogwarts School of Witchcraft and Wizardry. The above is in accordance with Educational Degree Number Twenty-eight. Signed: Cornelius Oswald Fudge, Minister of Magic." She reached up and tore it down. She looked around and saw the common room watching her, first years and seventh years alike. "I don't know about the rest of you, but I'm not taking this lying down. I won't go to class and if she gives me detention, I won't go!" Hermione interjected "Hannie! You'll get yourself expelled!" "I'd rather be expelled then take this. Who's with me?" A cheer echoed through the common room. Hermione said "But we could all get expelled!" Hannie put an arm around her shoulders. "Mione, would you rather risk getting expelled and getting Dumbledore back, or be a perfect student and have that old frog forever?" "Well, I want Dumbledore back." "Alright, you're with us then! Let's go to breakfast and remember, whatever you do, don't go to class! No one do any schoolwork! If you're in the library, you are NOT studying!" They Gryffindors nodded and filed out.

Harry turned to Hannie "What in the name of Quidditch are you doing?" "Harry, let me put it this way. Do you want to have your broom back?" "You know I do!" "Then just help me overthrow her. Dumbledore'll be back and everyone she expels will be back at school too." "You're screwed, you know that don't you?" "Yes."

At the end of breakfast, they all filed out and went to the Gryffindor common room. About 20 minutes later, Umbridge stormed in. "WHAT IS THE MEANING OF THIS?" she screeched. Hannie looked up "Meaning of what?" she asked innocently. "THE MEANING OF ALL OF YOU HERE WHEN YOU SHOULD BE IN CLASS!" Hannie said "Oh, THAT. Well you see, we're protesting. None of us will go to class or detention until you bring Dumbledore back." "YOU CAN'T DO THIS! IT'S AGAINST THE LAW!" (pretend this law is in existence, not sure if it is) "No it's not. We're allowed to protest peacefully. We're being peaceful. We're not using weapons, are we?" "If none of you are in class this afternoon, I'll start the whipping!" "Go ahead." Hannie said glaring at her and Umbridge stormed out.