I keep seeing advertisements for camp Erin? I think that is what it is. A camp for Kids and teens that have lost someone. Maybe there is some sort of camp or program like that locally in your area. Being with other teens that understand what she is going through will really help.
When I was a kid I was diagnosed with type I diabetes. I went to a week long summer camp for diabetes. It really helped me a ton. Just being with other teens that understood and "cool" adults. I know it isn't the same as losing a parent but it might help her with this hard time. Camp really helped me when I felt all alone