These type of scammers keep popping up and folk keep falling for it - A deposit for a brass nail - Never in a million years. It must be one of the oldest tricks going.
The only thing is as has been mentioned on here before if she's given you her bank details to transfer money to for a deposit, she'll be traceable and you can report her and hopefully get you money back. I'm not sure how you'd go about it myself but it must be worth a try.