She is so darn cute!
I trained mine using "no bark" in a deep voice. When you leave, can you turn on the tv? That would help mask the noises of people walking in the hallways. I feel for you. If I lived in an apt bldg, I imagine mine would be barking nonstop. Do you put her in a crate when you leave? If she has a crate, you could also put it in a bedroom or the farthest room from the door/hallway wall. These are the only suggestions I have. I am not a fan of the spray bottle technique anyway. There is just something about it that I don't like. I know it has helped some people, but that is just me...