My friend's grandmother died but I am still not going to forgive her.
That doesn't seem nice. Is there some way you can forgive her? Can you think of her grandmother?
No she has shown a pattern of selfishness.
It is wrong to hold grudges with friends. You should forgive them and try to move on without straining emotions any longer.
She is a girl and girls are all selfish. Just can't trust any of them.
I am sure that you can trust some girls and maybe you can learn to trust this one if you forgive her and give your friendship another try. Friends are supposed to talk to each other when there is a problem.