WITHOUT! The sashing on this particular quilt just cuts into the wonderful pattern and stops the eye from wondering around all the wonderful color in the quilt. IMHO :thumbup:
I am not a fan of sashing. I prefer the overall pattern look. But I also agree that you should ask your daughter which she likes since it is her quilt.
Another without. The white sashing breaks up the continuity of pattern that the D9P gives you. It is like remembering snatches of a dream, rather than the whole dream.