Layla Hassan is a member of the Assassin Brotherhood and former employee of Abstergo Industries. Forced to leave Abstergo following a Templar attempt on her life, she was offered a position with the Assassins by their leader, William Miles.
So basically this is gonna be sorting fictional characters into groups/teams/associations of any sort they were apart of during their respective canon. Make sure to clarify for teams with multiple incarnations in different media which one you're talking about.