I suggest you work on changing the way you're thinking. You've assumed some very negative reasons for what she's done. I can see her side of it. Many people do not know how to handle death. When she says that she was giving you space, try to accept that she is telling you what she thought would be best to do. And....your parents were important to her. Perhaps she needed space. There are many different ways to grieve.
I can understand why she would give to another organization. Often people suggest giving to this or this organization or an organization of your choice. Doing what she did is reasonable if you try to understand the way her mind was thinking. She did give in your parent's name. Why is that not good enough for you? Again, I can see this as her grieving.
Have you asked her why she avoids talking about your parents? My cousin recently died and a good friend of mine was not talking about him or his death. When I asked her why, she said that everytime she asked me how I was doing, I said, fine or OK: she thought I didn't want to talk about him.
When you didn't show up at the usual functions you are giving everybody the message that not only don't you want to talk about your parent's death but also you don't want to make it right with your friend. You've run away after their death and so your friend is reasonably thinking you don't want to talk about it.
Your description is of a good friend. I urge you to take the first step in working this out with her. Give her a call and say you'd like to be friends again and make a date to get together to talk about how you're feeling and how she's feeling.
Yes, it will be painful. But so worth it because I suggest that you'll find this is a misunderstanding that you can clear up.
I don't understand why you've cut all of your other friends out. You need those friendships and those times together that you've had all those years. It sounds like you're so hurt by this one friend that you can't even be in the same room with her. That is really extreme. It's "cutting off your nose to spite your face" to use an old saying.
You can get past it by clearing this up with your friend. Give her an opportunity to express her feelings. Start out by accepting that she means what she says. It's always poor practice to try to assign motivation to other people and what they say and do. We do not know what is in the other person's heart. Especially when it comes to highly emotional situations.
Have you considered that your parent's death has frightened her about her parent's death and she's not ready to deal with that? Or she just may feel awkward and not know how to talk with you. My friend said she felt a wall come up between us. When I thought about it, I did put up a wall. I was dealing internally with my feelings and although I wanted to talk about my cousin I didn't come right out and say that.
And resuming your usual supportive relationships with the other friends will also help. You've cut yourself off from support. You need those social get togethers.
My friend and I are good again. I suggest talking with your friend can result in the return of the good times.
I also suggest that you do grief counseling. Your feeling stunted is not just about the situation with your friend. When my parents died I attended a grief group at my local hospital, not the one they were in, and this helped me tremendously. Not only is attending an opportunity to talk about your situation and if you're comfortable your feelings but it also allows us to see the ways in which other people handle their grief.
Grief is just as complicated as parenting in many ways. The more we learn about it the better we're able to handle it.