Any time someone you have only met electronically asks you for money, she is going to be a romance scammer. There is no exception to that. You have probably had friends for years and years who have never asked to borrow money from you. It is just not what legitimate people do when they haven't even met you yet. A money request of any kind is the #1 sign of a scammer.
Here, she also not only wants you to loan her money but she claims she wants her lawyer from out of the country to send you money, and then you send it back to her. There is no legitimate reason at all for someone to want you to do this. If her so-called lawyer can send money to you, he can send it to her in the first place.
The only reason for doing it this way is that she is setting you up to launder stolen money. THe money you'd get is coming from another victim. There's no lawyer really involved at all. You, in turn, will be required to wire money via Western Union or MoneyGram, which protects the thieves because it's untraceable. When the victim catches on that he's been ripped off, whose address does he have? Yours! And you wind up in trouble for money laundering. You can tell the authorities about your "girlfriend" and her "Croatian lawyer," but nothing she has told you will check out. And the person on the hook is you.
Block this person from being able to contact you further. Send no money to her. She's a liar and a scammer and she's asking you to break the law.
Report the fraud to the FBI at their Internet Crime Complaint Center at IC3.gov. Notify Facebook so that they close her profile because she's using it to commit fraud.
Just checking in to see if you need more help or any clarification of my answer. If so, please reply here on this question thread.