When do you stop efforts for reconciliation with a friend?

I think you've done your part in trying to reconcile with her, but there's no action on her part which shows you that it's worth keeping. I think time heals all wounds but as to how long it takes, that's a mystery. However, I am putting myself in her shoes, perhaps with your constant efforts instead of making her forget the hurt you're adding insult to injury by constantly bugging her - I'm sorry for the words. When she's ready, then she will do the first step or perhaps time will make the both of you cross your ways. Therefore, take heed friend and just let her be. Don't contact her nor even ask about her to other people. Just let her be.

Hi blungel, The ball is now in her court. You have tried to be friends and she brushed off the attempt. Bless her and let her go. Make sure that you hold no ill feelings and it's quite possible that she will appraoch you someday and ask to be friends again. Any further attempts by you at the moment might only make things worse. Blessings.

when a friend becomes a person he/she used to be. or when she responded rudely and coldly towards you. Give her sometime. STOP approaching her. She will get back to you.

10 years of trying to reconcile with her is too much, but I really appreciate you for that, I guess she is a very valuable friend in that case that you make an effort for a long time to reach out with her. You have done your part Ma'am and I think if she doesn't want to be friend with you again that is her choice, I'm sure in due time she will reach out with you again.

I was wondering what was the cause of your misunderstanding. Maybe the pain was too much for her. I salute you for your patience, trying to reconcile with her for ten years. Give her space and pray that she will find forgiveness in her heart.