It really depends on how she died (if she did.) If she passed out and never awoke, or had a heart attack or a stroke of some kind, there might be nothing that showed anything other than that she was there in a certain apartment. If she was removed quickly from the apartment, not even sure if human remains-dogs would pick up a scent...a very good one might. And as you said, if she ws suffocated, for instance, there wouldn't be a "crime scene." There are a lot of ways to die without leaving behind a violent scene, I guess...