Dear Beth,
My heart goes out to you and your friend's family for the loss you have all suffered.
It is very difficult for some people to understand the essence of loving unconditionally (in fact I would probably say that the majority had difficulty with this). We bring personal experiences and expectations to any relationship and how we deal with them determines the person we are.
Part of the grieving process is anger and guilt - and people lash out at those who have left them behind for leaving them to their feelings of guilt (actual or perceived) and will not usually admit to themselves that this is the reason for them lashing out. Each person has to come to terms with their own grief.
Unfortunately all you can do is to remember the good times, share them with those around if you can, but try not to get too upset if they don't react in the way that you think they should/is the most appropriate.
If they were her true friends the pain will ease (for most if not all) and their anger will fade, but please try not to take the anger in, just quietly remind the others when the time is right of the positives.
Each person tries to cope the best way they can (whether consciously or subconsciously)....this includes your friend, her family and all her friends and acquaintances.
It is a painful time that each must work through - all each can do is be there for the other when the time is right and the need acknowledged.
I too send my prayers to you all.
Love,
AR