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.
......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.
Safe diversification is very important in this kind of scenarios. If one has more than one safe where they keep their Bitcoin holdings, even in situations were you are attacked, the robbers can not have any clues you saved your assets in multiple wallets and you might just show them the least wallet savings and they go away with that one alone thinking its all they have taken.
In some cases of wallets loss or misplaced keys, this method of storing assets in multiple wallets could also help because not all your assets would be in the wallet your lost access to. You can easily get over it because you have some of your assets still stored elsewhere you can easily access it without the stress of thinking about the one you lost access to.