She might be mad at you for not adding money to the account, but what happens when you keep adding money and it never turns into anything other than more lost money?

Then, on top of relationship issues, you'll have financial loss issues to boot.

There should be someone, somewhere that you can take her to to talk some sense into her. Find the scam online, or take her to your bank and sit down with a banker. Have the banker be the "bad guy" and tell her it's a scam. That takes you out of the equation and any feeling that the reason you're denying her the opportunity to make money is for some personal reason, and not because what she wants to do it a scam.

Good luck, brother!