My friend will comit suicide! Nothing i try doesn't helps!

My bestfriend, the one who i trust, the only one, best person in the whole world, she will comit to soicide and nothing i try helps her and she doesn't listens to me! I saved her several times but it's getting even worse she doesn't care about anything anymore! She gets angry when im trying to help and i can't tell anyone else because it will make everything worse, she will do that anyways and maybe faster if i tell anyone! How can i help?! What am i supposed to do?! I can't meet her in real life right now! Do i have any chance to save her by myself?! Therapist doesn't helps her too!