I don't see Paige's decision to return to DC as her returning to her 'old' life. I see it as her returning to her 'own' genuine life for the first time. She's been motivated all of her life by an intense need to connect with her family and in particular with her mother. She finally left them and that version of herself behind. What she does now is anybody's guess, but she's finally making independent decisions that aren't motivated by trying to bond with her parents.