And there isn't any answer to why. We'll never know what was truly going on inside her head, poor thing. We can only guess at the anguish that led to her to think the world would be better without her in it. There are no answers.
I was thinking about that conversation afterwards. How comforting it is to read - and write - fiction. There are answers. We can know what is going on inside the characters heads. And there are resolutions. Most novels start with something or someone disrupting the status quo, then the bulk is trying to resolve the problems that has created, and the end is when a new stability has been established.
I think that's why we read. Fiction has answers. It sorts problems out. Real life is cruel and sad and sometimes has no meaning at all. It happens, and continues happening. Fiction is finite. In 100,000 words or thereabouts it takes problems and solves them (or clearly hints that they are on the way to being solved). Yes, sometimes the ending is left open, but essentially, the main issue is resolved. Fiction provides security and reassurance in a scarily random world, and that has to be a good thing.
RIP Hannah. My thoughts are very much with you and your family.