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.
That's the same exact question I was about to ask too, because a thief can not come to rob you and go straight to the point asking you to transfer your Bitcoin if initially they never knew you had Bitcoin in possession. So it's obvious she must have said it publicly somewhere which gave those robbers idea she had Bitcoin, and as as, I think we all need to learn from this man's mistake to always keep our investment private, and also learn to always diversify our investment portfolio, so that if in case you are unlucky to be robbed, you will still be able to have the rest coins safe.