Is giving my girlfriend money for her mortgage closing costs and down payment considered fraud?
Sheesh, are people kidding here? It's a gift. It's not fraud. Just keep in mind that, because it's a gift, you cannot get it "back" if you break up--you are giving it to her. If you happen to get married at some point in the future, you will then own part of the apartment, but that is a completely separate matter. Give her the money, don't expect it back. Ever.