She's probably being led by the intelligence services on this, and of course they have ulterior motives, their ultimate project is to collect all signals, or as many as they can manage, which apps like whatsapp are thwarting at present.

Why can't we collect all the signals all the time?

This is incredibly dangerous for our society, no-one should have that much power. That power isn't about terrorism (or even very useful against terrorism), but about subverting governments, judiciary and businesses.