I wasn't surprised, probably would have done the same thing if I'd been her. If I'd not called, I'd have wondered if I'd done the right thing, if she was just making a cry for help. When a person's life has become so painful as to be not worth living, then it may be time. But only if there is objectively no hope. For instance, a person with a terminal disease might have reached that point and know there will be no cure only palitative care.
Some persons can have mental or physical pain that is the equal.
Years of attempts to change the pain has failed and no end in sight. How can I say they don't have the right to end that pain. That is rude and unfair. If you chose to end your life, do so with some regard for others. Don't leave them with such a nightmare.