Assuming it's part of a game, I should look into the FNaF universe. The Help Wanted game does have a character named Abby, and there's a faction system where players choose between two groups: the Freddy Fazbear's Pizza (FFP) or the Pizzeria Simon's. The factions might have different characters involved. If Nadine is part of one of these factions or a new character, maybe unlocking exclusive content related to her requires certain actions.