I know this may take time, but you can observe the patterns of her going out and then go out at the same time and meet her by 'coincidence'.
Or just knock on her door and ask for some favour too (you can say that your hair-dryer stopped working and you need to dry your hair because you are going to some meeting so try to borrow it from her or say something of such matter so that it would sound real).
Hope that helps! Pls keep us updated about how you are doing!!!
