Look, no where did I say US should not pursue further investigation if this woman was radicalised in Pakistan. I will not shy away from the fact that certain religious establishments are involved in radicalisation. What I am merely pointing out is that what is happening in Pakistan is an advanced form of cancer of extremist ideology, it is not where the ideology comes from. Foundation for that is the patronage of the House of Saud. You cannot keep treating symptons but ignore the origin of the disease.
The fact of the matter is, the US and all western governments know that Saudi Arabia is ground zero for most extremist groups in terms of ideological backing. The US can stop all trade with pakistan but it will not stop terrorist attacks in US or anywhere else in the world, as long as the Saudis and their partners in the gulf are freely allowed to export extremist ideology around the world, no amount of name calling Pakistan will stop them.
I know someone who met ambassadors of various European countries and they were asked about the best way to stop terrorism. The answer they were given was that 'you all know where the extremists get their ideological cover, together with funds, cut that off and you cut off a significant amount of terrorism.' They all, however, bowed in silent and did not attempt to dispute this nor did they say they will do anything to stop this. Maybe its time the US and western allies "do more" to stop their terrorist buddy Saudi in stopping the export of extremism around the world?
Most murders are premediated. The people doing the killings have motivations and desires that they seek to accomplish with an act of murder, barring few cases. You cannot boil this argument down to "men kill people". That way you will never be able to combat extremism. The fact of the matter is, this woman at least, was "radicalised" in favour of ISIS. She pledged alliegiance to it. Which basically means she espouses the same desires and motivations that they do. Now lets go back and see what the ideology of ISIS is. It's just another branch of the ideology widespread in Saudi Arabia, this ideology is being exported around the Muslim world with full knowledge of the US. Look, I know you're an Indian, so your thought process is already bias against Pakistan. But I am not absolving Pakistanis who have committed terrorist acts. But if you do not look at the motivation behind criminal and terrorist acts, you will never be able to combat it. Are you familliar with a murder investigation? Motivation is one of the first thing that is looked at.