1) See a full body shot of the girl on video when chatting.
2) Go to visit the girl before you start sending money.
3) Meet her family. Parents and as many relatives as possible. Even if you have to go to a far province to meet them or fly them to a safer place to meet the family.
4)Meet as many of her friends as possible.
5)Go to places with her that know her and see how the people react to her and you being with her. How does she introduce you to them? Friend, boyfriend or nothing...