Such a heartbreaking situation for you.
Whatever it takes for you to get through this time - that is what you do. If that means you go to church, or go for a walk, or go shopping - it doesn't matter.
Will there be a funeral? Could you have your own special time for her here?
And it is always good to talk. Sometimes you can feel as if you are just going over and over and over things and people don't want to listen. But talking is always good. People understand.
Allow yourself to be angry, to cry, and don't feel guilty if you feel happy.