I am curios as to how the robbers got to know about their bitcoin holdings. Did she discussed about bitcoin to anybody out there before that day?  or  the possibility of registering with a local exchange where they must have gotten her details to have tracked her to her home and attack her.

Looking at the image above as one of the things  used to carrying such act, I believe sometimes things happens maybe just to create an impression for people to see either in good or bad ways.  How are we sure that they intentionally did use the above equipment just to discredit the company for reasons best known to them alone. Some times people act in that way and they end up tarnishing the reputation of others at their own interest.