hi Olaf, and

wow. things sound really stressful for you.
its hard enough when a loved one is suicidal, that much harder when they are threatening you with it.
What do I do?
take things one step at a time. to begin with, it would be really prudent to build your support system. experts will tell you its critical.
youll need to prioritize in terms of the biggest dilemmas here. i would really encourage you to seek out local suicidal ideation resources. dealing with suicide threats is no simple task, but they can help you navigate.
how long has this been going on? you mention she has had suicide attempts in the past?