I am so sorry to read about this.
Well, piano isn't everything. It happens to me as well, although I have not been through any bigger personal disaster lately, just the everyday issues with too much work, troublesome kids etcetera. During these tough periods I go easy with myself, I let the piano rest if I don't feel I can focus on it anyway. But I come back, and I find that it is good healing for me.
Doing this - just sit at the piano and totally indulge in the task of making a nice transition between two chords or get better hand moves in bar 23-27, that is like meditation to me. To **** with the rest of the world, THIS is what matters to me right now. That feeling is sometimes very good for my soul.
A way to find your way back to the piano is to engage in many activities around piano playing. Go to concerts, listen to concerts, watch streamings and videos, read articles, visit discussion boards like this one (yes!), go to piano shops and try new models out just for fun, read books about technique, about composers, try to find something new. The more attachment points and associations you get to piano playing, the more you will be attracted to it, and it will be an important part of your life again. I guess that the majority of your mental "attachment points" right now have to do with your mother in one way or the other, there is where you have your focus. This is totally logical and you shouldn't have done anything differently. But now you must move your focus again, and that means that you mentally have to move your whole world again, it is not about just one isolated activity or two. It is not done in an instant either.
But even if you need a lot of these associations, you also need to concentrate. So, when you feel ready to begin with your own practice again, maybe you should start ambitiously on a deep detail level, like working with just four bars in one piece or something. This will make you remember what it was like. Just a suggestion, maybe it will work for you, maybe not.