Wow that would be hard to deal with but you really can’t do much more than you are doing already. Just keep praying for her. I’m sure that she knows that we all have a free will and she will have to decide what she believes in.
There was a boy in my oldest son’s class who decided not to be confirmed. They graduated and he went away to the military. I just heard from his aunt at a meeting that he had surprised them by getting confirmed. He did not tell the family about it ahead of time.
So there is always hope. Just love her and keep praying for her!