Some friendships could cost someone if it's lost. I always guide my friendship with care, I don't have many closed friends. I have only two, but I can't toy with those two and I can't cut ties with them.
I think that friend did something bad to the other one, she needs to meet physically and ask for forgiveness instead of asking what she did wrong.
She can't just change to her without any reason, someone might have passed the wrong accusation to the other one.
The best to go about this situation is to meet with her friend physically and they will discuss the situation.
She said she has met with her on different occasions and this lady isn't ready to open up. She just wants to end it that way which isn't good. I think she is just too hard, I mean the other lady who isn't ready to open up.
Sometimes, two people need to work. I have met people who just changed on me for no reason. We were suposed to be best friends and we were together for almost five years. She'd always switch up on me and I would be the one apologizing because I really valued what we had until the day I couldn't anymore. We haven't spoken since then after she humiliated me in public. Sometimes, people can just change with no valid reason other than you have made yourself too available and they take it for granted.
That's serious, and that's not a genuine friend.
A genuine friend will find it difficult to lose the friendship.