I had rampant suicidal thoughts/fantasies from the time I was about in 10th grade until I'd been married at least 6 years, and actually attempted suicide when I'd been married about 2 years, so I can identify. Not sure what you can do to help, though, that you haven't done already. She desperately needs counseling, and she's the only one who can request it, unfortunately. Maybe if you could convince her to present herself at the nearest mental hospital, she could get herself admitted, and then maybe she could get treated. Dunno. When I was in that position, I had nobody to talk to, so she's already luckier than I was. I just ultimately put myself in denial, toughed it out, made the best of it. 30-odd years later, here I am. I do NOT recommend that course of action. I do hope she gets some help...