Lillian Potter: Harry Potter's Twin Sister
Lillian Potter, a feisty, slightly crazy, brave girl, has lived most of her life so far in misery, raised by the Dursley's. When she and her twin brother Harry are told they are wizards, their whole life is about to change.
They head off for Hogwarts School of Witchcraft and Wizardry, only to be met with more chaos than they've ever experienced, even having lived with the Dursley's their whole life. Every year, something new seems to happen that prevents Lillian and her brother Harry from having a normal year.
From finding out the truth about several things in her life, meeting the best friends she could ever make, and being in constant danger, Lillian is in for seven years worth of craziness.