Mischief Managed

What if Hermione was never actually Hermione Granger but instead Hermione Silver. A pureblood witch orphaned at birth and being brought up by a school of muggles known as St Trinians. defenders of anarchy. How would this affect the events as we known them? Follow her through her Hogwarts years as she finds mischief, trouble and love. Fred/Hermione/George.