Let her do it. It's obvious nothing of value would be lost.
It's 99.999% likely this is just her trying to manipulate you into going back to her, or she's just pissed because you're seeing someone and she isn't.
People play this card all the time... my douche of a father did it to my mom several times when they were getting divorced - and he actually showed up at our house in the middle of the night OD'd on painkillers. Twice.
He even told my sister, age 4 at the time, "Daddy tried to kill himself because Mommy won't let him live with you".
I've also had a girlfriend begrudgingly breakup with me because her ex was calling her constantly threatening suicide. She fell for it and went back to him - and was miserable for the next four years, until she caught him cheating on her. I think my parting words to her was "if you are seriously going to buy into that, okay - I'll miss you, but I'm not going to try and manipulate you into feeling sorry for me".
My initial reaction to your situation would be to tell her to cut the shit and something like "you made it clear you didn't really care about our relationship when you stopped talking to me" - tailored to your situation.
If she keeps at it, maybe even call the cops. I think that's a bit of an over reaction, but it'll teach her suicide threats are not to be thrown around lightly.
there, translated for youCALL DA POE-LEEEES
She dead yet?
well the point is you call the cops on that crazy bitch then let her get all the attention from them that she wants.
Your civic duty would be done after that.
I'd go as far as telling her parnets, fuck calling one time.
It depends on how she said it... "If you don't come back to me I'm going to kill myself" just a figure of speech no need to worry.
"If you don't come back to me I'm going to commit suicide." When's the last time someone said something like this and actually meant it. Move along.
Now if she has something crazy planned out that might raise some red flags, but I'd not worry about it. You are posting on the internet after all you have no soul and thus won't feel bad if she does it anyways.
3 response archetypes I can see so far.
1.) Civic minded and compassionate advice: call her/the parents/cops/whoever to prevent a possible tragedy.
2.) Cynical advice: call her bluff somehow. She's manipulating you/being an attention whore.
3.) Really cynical advice: let her do it and laugh about it afterwards, and since you're probably just as much a waste of skin it's best you follow a good example and off yourself along with her.
I'm with number 3 m'self.