Suicide or attempted suicide is always a very hard thing to experience in anyone's life. My best friend's step dad did exactly the same and it is very hard to get over.
As a friend, she should be there for you no matter what, and her humorous take on your experience is just not on. If anything, as you both have had similar experiences, you should be able to empathize with each other and help each other through a situation, not be forced apart.
It sounds to me that she isn't a very good friend, and that you should really start thinking about relying upon other people for support. But this doesn't mean give up on her. Maybe she'll come around if you have a face-to-face talk instead of an impersonal written note. Sometimes talking really is the best answer.
I wish you all the best in life and I hope everything turns out fine n_n
