Also, and I don't mean to sound rude Thorns, but "reminding" a suicidal person that "you'll be sad if they were to die" has the potential to backfire. OP’s friend might for example blame herself for making op sad, she can regret opening up about her suicidalness in the first place, or she might think that the op doesn’t care about her as a person, but only cares for her as a friend. And if you "constantly" say to your friend how much she matters to you, she might very well end up thinking that you’re pitying her and doesn’t really mean it. Basically what I'm getting at is that you have no real way of knowing how a suicidal and likely depressed person is going to react to the things you say. It’s common for suicidal/depressed people to overthink and see things that aren’t really there. I might be projecting, but I know I did that a lot when I was depressed. I lied to people I loved all the time, and were pissed or sad or upset at them in private. That doesn’t mean,
>>1, that you shouldn’t tell her that you care for her, just be careful with what you say.
This is a terrible burden on you anon, one that you shouldn't have to bear, and please remember that you also need to take care of yourself. And again, what’s most important is that your friend gets proper professional help.
(And I’m just saying, I am not a medical professional in any sense of the word. This is all based on my own experiences with depression/suicidalness, and from having close friends who’ve also been depressed and suicidal. Ultimately, these things are going to differ a lot from person to person.)