Does the United States require a Basic Travel Allowance for those entering from Nigeria?

My Fiance' is a traveling nurse, who ended up in Nigeria. Now in order to leave they are telling her she need to produce a Basic Travel Allowance.

View this post on my blog: http://travelnursesuccess.com/does-the-united-states-require-a-basic-travel-allowance-for-those-entering-from-nigeria