Privacy? Sure. Respect? No. The people who love her will not respect her for leaving them that way.I think we all probably know how it is not to feel valuable at some time. Unhappy times eventually go away. Sometimes it takes a long time - a long, miserable time. I know that from experience.
She is not the only person in the world who has ever felt that way.
Do you have a crisis intervention center in your area, or a mobile crisis unit? They may be able to help.
Don't give up on her.