I’m very sorry this is happening to you and so sorry for what she and her family are going through. A death of a loved one is such an awful thing to experience. Everyone deals with loss in different ways, she may just need some time and space to grieve. Let her know that you love her and that you are there to listen if she needs anything. Then let her be for a week and see if the space and time to herself allows her to heal enough to talk to you. Maybe send her a text at the end of the week to say you love her and are thinking of her.

My husbands sister committed suicide and he became very withdrawn. I just let him know I was there if he needed anything. To this day, he doesn't speak about it and never did much. That's his way of dealing with it, not that I agree.

Good luck. My best thoughts are with you.