Hogwarts power

so obviously it's Hogwarts and your a girl like always your name is ivy your James sister and your older voldomort knows u exist but never thinks abt u and your out for revenge harry also knows u exist and thinks abt u rarely but it happens story: so you went to voldomorts house (so he has his own house in this ok and it's fairly big) the golden trio are out nearby and spying don't ask why and they have no idea what your doing and u guessed it this is the day of revenge...