I'm mixed on this one. I do believe that she married a bad guy and one that probably has ties to terrorists. He probably is/was one himself. I do not, however, find all of her allegations credible. The Bin Laden story isn't credible. There is no reason for him to try and come to the US. Why would he? Recruiting? No way. He doesn't speak the language and hates us. It would be like breaking into Rikers.
Nevertheless, I find it utterly believable that the FBI blew her off as a crackpot and only became interested after the fact.