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The best way to make sure this doesn't happen to anyone else is to report her.
First of all report the scam to your police. Then report her online to the FBI. They have a site called the Internet Crime Complaint Center which is specifically for internet related fraud matters. There the FBI is partnered with Interpol, which will give your information to law enforcement authorities all over the world. Ghana tends to look the other way on romance frauds, but with pressure they may be willing to investigate.
From there, there's a lot you can do to warn others. First of all contact the site where you found her and report her as a fraud. If you met her on Facebook, report her so that they close her profile. Warn her Facebook friends.
Run the photos she gave you on Google Search by Image. If that turns up a lot of scam warnings about her, post on those sites and add your voice to the rest of the people so that future victims will know that she is still actively scamming.
Post your story on your own Facebook account and on other social networking sites that you may belong to. If you'd rather be anonymous and not tell your story on Facebook, post her photo and disclose this fraud on sites like Romancescam.com, Scamwarners.com, Scamdex.com, pigbusters.net and any others in that vein that you can find. Yahoo has a group scam victims that gets pretty wide exposure. You have to join it but once you do, you can post there as well.
Sometimes on sites such as the above you can find yourself networking and exchanging details with others who were scammed by the same person, which will give you more information to give to the authorities to help them find her.
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