I'm not trying to encourage you to ctb, but to bring some more perspective, because this seems somewhat co-dependent to me, that is, taking on the responsibility for others' problems you did not cause, cannot cure, and cannot control.
These are some of the ways I look at what you wrote in the OP:
You are not responsible for her life, failures, successes, etc. You can't control her or anything about her life. Isn't it enough pressure trying to manage your own life and choices? I get that we have responsibility to others with whom we're in reciprocal, mutually supportive relationships, but I think it's codependency and magical thinking to take responsibility for other autonomous adults. Would you want her to be doing all this worrying about you if she wanted to make the choice to end her life and if she had the same reasons for doing it that you do? If yes, then maybe you're not yet making the right choice for yourself. If no, then is this a reasonable burden that you're putting on yourself? And as far as her family's hopes for her go, the only thing that matters is what she hopes for herself, but I gently say that you and her family all seem to be making decisions based on what they want for her or the hopes they have for her; have you or any of them asked her what she wants for herself? You take on such a huge burden for her; can she take on the burden of responsibility for your life, your decisions, and your happiness? If you told her what you were considering and asked her, would she take on those responsibilities, and could she follow through?