Short version: don't send money
Really no need for detailed analysis. Member responded to an ad on STG, girl tried a possible / probable scam, poster was kind enough to send a token amount but the girl wanted more. Then the girl got pissed when our guy suggested that she do what she had advertised to do. Probably had no intention of performing any actual services.
Typical female behavior, IMO. They are hard-wired to get whatever they can out of a man. Some dress it up with the "wife" routine but it's still there, just under the surface. Modern feminism is never going to undo thousands of years of "programming".