^_^
Until i read about aspergers i was pretty convinced i was a sociopath.
I don't look at stealing as bad and wrong. I think that is a foolish, childish way of looking at it. For the most part i consider stealing unacceptable. That for a society to function at least part of it, and preferably a vast majority of it must not steal the vast majority of its produce. A society could still function when a large part of its produce is stolen by its members if the produce is large enough. Even though i say that it is unacceptable, i don't mean that I don't steal myself. I steal mp3's, and some other goods.
Besides the math of proper society function, there is little reason for stealers to be judged bad, evil, or wrong. The function for such feelings in society is that dumber people - and most smart people, work much more reliably off of strongly internalized emotions than logic and reason. And these emotions in part hold together the structure of society. That is not to say that logic and reason don't also play a part.
If the item is small enough in value, it doesn't impact the society as a whole very much. And if your country is rich, a small item doesnt impact it nearly at all. So the theft of one vodka bottle is not a very "evil" act, if you were to quantify evil by how much it impacts society.
Although how you judge people is your own business, i suggest you should take this act with a grain of salt. If they don't want to talk about it, act like it didn't happen. And if she wants to borrow something, be careful, but not too obvious. Build your trust slowly, and be aware if this is a repeated offense. If she continues to steal, know about it, and be friends but don't put too much on the line. This could have just been an impulsive spur of the moment thing, and even she feels very guilty about it. So wait for more evidence before you pass judgement on her. Unless you learn otherwise it may have even been an accident.
You will become even deeper friends if you don't immediately pass judgement on her. People like that.