Until she is truly ready to quit, it will happen again. And again. Unfortunately, nothing you say or do will make her ready.
Welcome to SR. I'm sorry you are dealing with this, but you have found a place of tremendous support. Please read the stickie posts at the top of this forum. You will find a lot of helpful information there. You can't change her, but you can learn to have serenity for yourself regardless of what she chooses to do.