newstart, I understand. I know how you feel.
I am so very sorry your friend made this choice.
I was devastated too when my son-in-law killed himself ......there are so many unanswered questions, regret, wondering if we could have saved him......sigh.....it was a process to work thru my own feelings and then try to be present for my daughter and the children, it was a nightmare on so many levels.
Support is what helped.
Talking to your friends, making that list and burning it, addressing your emotions, your grief, your devastation......you're doing all the right things........ and I know it still feels horrible.
It's going to take time.
Here's a bit of advice from someone whose been there.......try really hard to let go of trying to figure out why she did it......it is a circular mess which has no end....it took me a long time, but I realized that I was never going to know the reason and what I had to do was learn to accept it. Very much like what most of us learn here on this site, how to accept what we have no control over, what we are powerless to do anything about.
There isn't anything you could have done to save her......nothing.....you don't have that kind of power......nor do I.....all we can do is ......
Learn acceptance.
Acceptance is what ultimately brings you peace......you already know that.....it's just walking thru this part that is so very, very hard.
I have enormous empathy for you newstart, with all you've been dealing with with your daughter, your mother's passing.....you're really facing so much right now.........all very challenging stuff too. You must be one strong woman to be able to stand in the middle of so much grief and sorrow and remain intact.......
.....on the other side of that grief and sorrow is peace......you're headed directly there.....be very, very kind to yourself.
Many hugs and love to you my friend.....you'll get thru this......we're here for you.....