If she wants to have the conversation, it's because she wants to talk, and she wants you to listen.
So start there, listen a lot, talk a little. Validate. Take responsibility for what you could have done differently. Accept her feelings. Don't project your feelings onto her.
When you do say something be clear. Don't make her responsible for your feelings.
But mostly listen. After she tells you something, say something like, "I hear that you are saying ....." Make sure that you understand what she meant, not what she said. And that she knows you understand.
