To preface this, I know absolutely
nothing about the direction that the author of this VN wants to go, or what he intends. That disclaimer having been stated, according to the storyline there is a fire, and the MC
assumes that Maggie is dead. There is no confirmation that she died (like the MC or someone else found her body).
Therefore, the possibility is always left open that Maggie managed to escape and will reappear in the story (kinda like Lassie). Sometimes, especially in fiction, cats aren't the only ones with "9 lives."