Hello,i met a girl online from austrilia and she is in a fashion school over there and i need to know what it?

i need to know what it takes to fly over here to the united states ,she is telling me that she has to get cleared at the hospital for her passport to fly over here i need to no if this is true or its a scam she sas she loves me and wants to spend the rest of her life with me but something doesn't feel right about this ive sent her 200.00 and she is asking for 500.00 more plus the air plain ticket which is 2200.00 and im gonna book it here so can any one help me on this matter before i make a mistake,thank you !