I also know someone is currently suicidal, but she is much older, and having serious financial and marital problems. A year ago, as a result of these issues, she had developed a serious drinking problem, and had a TIA. She recently denied to me that she was suicidal, but then a couple of weeks later confessed to me that she had lied. I'm very worried about her, particularly since she has not returned my last two calls. She also told me that she is deeply ashamed of all of this, which is why she concealed it from me.
People make mistakes. Suicide is a mistake that cannot be undone.
I hope she has some friend or kin that keeps in touch on a regular basis. Best if somebody can say to her, "If you feel like committing suicide, please promise to call me and talk to me before you do anything." She has to say it: "Yes, I will talk to you before I do anything." That is actually a huge help.
I was once (27 years ago) at the intersection of about 6 life crises coming at once. I thought about drowning myself in the bathtub-- an impulse, I could have done it in a flash --- but what stopped me was realizing that my father or mother would find my body, and it would be too horribly cruel to them.
But sometimes people are so depressed they can't even think that far.
I will pray for your friend when I pray for my friend's daughter "Lovely Girl." I will ask Our Lord to draw to them the people they need.