Well, as swarthyguy noted, a good number of Chechen and Kashmiri al-Qaeda affiliates have honed the fine art of female suicide bombers. I don't see any reason why the core network would adopt all that much of a different approach.
A good number of the terrorists in the Russian movie theater hostage/murder/crisis were women.
The same thing occurred to me. I don't think ANYONE from middle eastern countries should even be allowed to enter America in this time of increased security risk.