I am so sorry you have to endure such treatment. It will take time to adjust to your new life and to the death of you mother and grandmother.

Painful as it is to be excluded from your friends life, her parents are trying to protect her. I'm not sure I see a way for you to see your friend outside talking her parents in to letting you visit. Maybe as your friend's mood improves she will be allowed more freedom.

I wish you both the best.