Don't feel bad; she's manipulative.
There has to be some way to contact the powers that be at kik. Here it is: http://www.kik.com/contact/
Report her crap, then block her, and don't look back.
She is just trying to make you feel bad. This is a form of trolling. If she really needs help, she isn't going to get it on kik by engaging in this form of fake suicide drama. Maybe if she's ejected from kik enough times, something will sink in. It's far more likely, though, that she isn't mentally ill so much as she's a self-centered attention whore.
There are people who truly need help. But they generally don't do this kind of thing. Maybe I'm wrong. But either way, it's not your responsibility. As with anyone else who ever makes you feel uncomfortable online, follow these three steps:
- Walk away without a second thought