Yeah, something's off...

Firstly, though, don't look at her behavior as an indicator of whether or not she's been raped. There is no "rape victim" profile. People can react to sexual assault in any number of different ways, and some hardly react at all. A lot of people don't go to the police (especially if it was a cop who did it), and I wouldn't either. She might be partying excessively to distract herself from the trauma. Or she might be lying. You just can't really know for sure. And honestly, it isn't up to you to determine that.

Either way, I wouldn't mention any sort of doubt regarding her claims of being raped. Instead, I think you should sit her down for a heart-to-heart to ask her about the passport issue and whether or not she wants to go with you to Europe. You should also make it very clear that you'll accept her answer regardless of what it is, and that you'll still keep in touch if she ever needs someone to talk to about her traumatic experience (again, don't even mention that you doubt it happened - you have no proof, and it's just poor form).

Although, everything else you've mentioned about her seems rather alarming - refusing to get a passport or a job, but proposing you have a baby together. I would probably break up with her, but you do you.