Rosalie Euphemia Lupin-Black Potter

Rosalie Euphemia Lupin-Black, previously known as Potter, travels back in time, by the magic of Hogwarts and Death, to the Marauders' 6th year with her friends. What happens when the Marauders find out that the Potters disowned her? What if all 4 eras are under one roof? Things are not what they seem.