I've known a Colombian SW for 2 years come October. Last year, we spent about a week together on vacation in April. I saw her again in July in another country, and in between she asked for money for her sobrino's birthday party. Now, I actually knew prior to seeing her in April, when his birthday was. I was also able to verify the party taking place. Honestly, as his madrina, she probably takes better care of the little K*D than his mom does. But I told her... very bluntly, that I wouldn't be sending anymore money at all, and I would provide money only the next time we were in physical proximity. She hasn't asked me for money since, and we still chat, though not as often as we used to. I think she understood and believed I would not send anymore money, but I also know she continues to be a sex worker to this very day.

Things become more difficult if you are invested in the relationship. If you have a non refundable plane ticket to see her, and she asks for money between now and the flight, then you are between a rock and a hard place, because if you cancel the flight you are not getting your money back either. If you don't have a future date set, then I would just block her and move on to the next girl. There are plenty of girls out there... you don't have to be dead set on one in particular, especially if the one in question doesn't know how to take no for an answer.