Detective...
Hey; we all know you're concerned. Thats good.
I would ask the gatekeeper. What if something happened to her in her apartment? I don't think its wrong to worry about another individual. I would assume she left the country. If she did leave, how did she get to the airport? Taxi? A friend? Talk to her babysitter, maybe she would know something.
I know this may sound low to some of you; but if I were in your shoes and you want to find out if she is ignoring you (or MIA) put a piece of Scotch tape on the top of her door. Check it later in the week. I know that sounds strange but in a situation like this - it could help out.
Other than that, its most likely a legitimite excuse so I wouldn't worry about it for the moment. See how long goes by - then make your decision on the facts that you do know.
I hope she's O.K!
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Cobra brakes are on! Finally.....
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