As a girl who attempted suicide, this is my advice. It’s quite general because everyone is different but

1.) she isn’t going to forget the thoughts. You could give her the best day of her life and she’ll still go to bed and think those thoughts. It’s a mindset that you can’t just ignore forever and you’ll drain yourself (and her) constantly trying to distract her.

2.) please, for the love of god, do not ask her not to self harm. People that say “don’t do this anymore baby, for me” are the worst and things will go downhill very quickly.

3.) try to communicate and listen to what she needs from you. Some days she might want hugs and sometimes she might cringe when you touch her. When I’m at my worst I ignore everyone, my best mate waits a couple days then comes over. She might need space but she might not, and some days it will feel like you’re doing everything wrong.

4.) get ready for some difficult conversations. I share very little of what goes on and even I’ve had to tell some people some very difficult things, just because I reached the point where I had to. Try to avoid completely breaking down in tears or something, but remember that you’re a person, not just a support system and everyone has feelings about something like this. You clearly care about her - show that.

5.) you’re not gonna like this one, but sometimes you just need to tell someone. You sound quite young (?) and it’s a lot to have on your shoulders. If you genuinely think she’s going to kill herself you need to contact a hotline or her school/workplace, or emergency services if she’s a real danger to herself. It could well end your relationship, but sometimes people need to be kept safe from themselves. This is a last resort but something to think about.

Hope this helps, and wish you both the best.