When my daughter estranged herself, it was really difficult for her elder sister and brother, because, like mugnanny's younger daughter, they were afraid that their sister would fall out with them too. I asked them if they could act as go-between, but they both refused, and I found this really surprising and quite upsetting at the time, because they knew how despairing I was! When I asked them if she ever spoke of me, they said that she didn't - I felt as if she'd wiped me out of her life! So I do understand the difficulties that this causes, mugnanny. Keep trying. Write your letter, tell her how you love and miss her. If it's any help at all, I'd suggest that you don't speak of the problem? Let it go.