She is a level-headed girl, no fantasies, she has to be at work today. We live near New York. She is a young attractive woman of 30, can this play a role? Could she be abducted? She stayed in a hotel Warszawa Frederyk Chopin at Al. Jana Pawla II.
I would not think she has been abducted, from the language you have used it seem slike you may think she has been adbucted by sex traffickers. To put you at ease about this, the people running these rings don't tend to abduct western women (and no offence) they also usually tend to go for the younger age scale (even if she was an attractive 30) 15,16,17,18 etc etc is usually their age range. THe other thing is that abducting a British/American is that the investigation for missing persons is a lot better than say in Asia or even in Eastern Europe.
Unless there is any other possible reason you could think she has been abducted, i think you can be safe in the mind she has not been taken anywhere.
Did she take a cab ? if so, did the hotel order it ?
this is a very important point, if the hotel can confirm whether she did/did not take a cab and with which company, there may be a way you can atleast find her last known whereabouts through the cab company.
Does she have a mobile phone ? The phone company might be able to trace the signal.
I would also look down this avenue too, mobile phones can be tracked if they are switched on. Did your daughter take her original mobile phone or a replacement that worked within the EU community??
I wish you all the best in the hunt for your daughter, i'm sure she will turn up safe and well somewhere with a clear explanation.