(Not) Forgiving Oneself

I went to see a young(ish) woman who was terminally ill. She felt enormous guilt for having slept with a married man -- once her boyfriend. I said to her: “You need to ask God to forgive you.” She said: “No. I need to forgive myself.” This conversation repeated itself a few times. I said to her: “This is not working. It’s not possible to forgive yourself. Exactly how much progress have you made in forgiving yourself?” She said: “None.” OBSERVATION: She listened carefully, but I don't know how she resolved the issue -- if she ever did. She went into rapid decline and died.