according to the action -> means -> purpose (AMP) model, trafficking requires two things (not always simultaneously): movement, and commerciality.
commerciality is defined as any thing that is of value that is exchanged between any person (food, shelter, jewelry, money, gifts) and movement is that the person is moved somewhere (typically across state/provincial lines but it can involve countres as well.)
in the united states federal code trafficking occurs at any time if a minor is involved in soliciting commercial sex acts, so this could fall under the defenition of trafficking if commerciality is a factor.