[[WMG: The next tenant will be Burgundy]]
Despite the fact that Bob broke up with her, she still seemed as if she wanted to stay around the apartment. Furthermore, she already knows about the crazy things which happen to those living in there, so it wouldn't take her that long to adjust. Plus, her hair is a slightly unusual color, so it's fully possible that she (like, say, Karl) has some magical blood in her veins.