Other reports have suggested traffickers are pretending to be rescuers, in order to access children.
Last month's earthquake has killed more than 7000 people, and left hundreds of thousands of people homeless, making women particularly vulnerable to human traffickers.
Catherine Collar, from Christian charity Stop the Traffik, told Premier: "The traffickers are using their usual ways of working which is to target people that are incredibly vulnerable. And that's how traffickers work over the whole of the world, is that they will pick people that they know are in a situation, that desperately need help, and have no other way of getting access to that help.
"[The crisis situation]... makes it much more easier for them to get hold of, particularly in this situation, girls. A lot of them will become dispersed from their networks of people that they know, they will be in need... for example food, drink, water.
"So they will go wherever they can to get those things. So if you've got somebody who's offering, and acting like they have knowledge... then they are more likely to go with those people.
"And it's a very chaotic situation, the patterns of life that you might have been living in have just been disrupted... so how you might normally deal with the situation... would probably be very different. I think it heightens their vulnerability a great deal."
"It's an organised criminal business, so they think in terms of where they're going to make the biggest amount of profit. People that are obviously in poverty, and people that are in disasters zones, are definitely a way of being able to get a lot of what they would deem in their industry - product."
The United Nations says approximately 12,000-15,000 girls are trafficked every year from Nepal.
Stop the Traffik is holding a worldwide event called Freedom Sunday on October 18th October, where churches will be raising awareness of human trafficking and making commitments to help stop it.
Listen to Catherine Collar speaking to Premier's Aaron James: