According to her account, at some point she Googled "pressure cooker" while around the same time her husband apparently searched for backpacks. Weeks pass and they get the visit from the authorities, when her husband is asked, among other things, if they own a pressure cooker or had ever searched about how to make a bomb from one ...

Now, I can see where one can make the logical assumption these events are related -- 2+2=4, after all ...

But so does 1+3, 1+1+1+1 and 1+2+1 ... the reason for the visit by the authorities could have only tangentially been related to the family's googling, or perhaps unrelated completely. Apparently her husband didn't ask.

As the article you linked states WAY down the page:

"It is also possible that there were other factors that prompted the government's interest in Catalano and her husband. He travels to Asia, she notes in her article. Who knows."

And then rather stupidly adds: "Which is largely Catalano's point."

No, actually, her point is that she assumes the visit is a result of her family's Googling activities and that therefore the government must be reading her searches ...

... which very well may be true. But so may a lot of other causes and Ms. Catalano's account doesn't offer much in the way of real proof. The real question is what in fact prompted the visit from the authorities? THEN we can start worrying about the government accessing internet searches if that's the reason ...