How to get my fiance out of Nigeria with an inheritance check after paying all an inheritance check after paying all they're BTA fairs in all their ot

My fiance is over in Lagos Airport trying to get back to the United States she has her visa she has her passport all of that is legal she has an inheritance check now they won't let her get on the airplane with it I need help getting her out of there please help they're going to try and charge you another $5,000 I am not paying that I've already paid everything I was told to this is a bunch of crap