The Hidden Marauder (Harry Potter FanFiction)

Completed in 2013.
Riddled with grief, Katherine abandoned the Wizarding world and hid away. She vowed only to return when her loved ones needed her the most, even though she knew that it would hurt her as much as them to keep such a promise. She did not want to leave them, but she felt it was necessary. She felt that she needed to recover from her losses - to become stronger, wittier, braver; to be the best she could possibly be.