I think it looks good both ways, if it were mine I think I would go with no sash because you said you were having it quilted edge to edge. Either will come out fine though.
I never thought of sashing with D9P, but I like it. I am wondering though, which way did you go? You have received so many opinions....but what did you end up doing?
I think she'll love it however you decide to do it! It's really your preference. Personally, I like it without the sashing. Good luck with that decision!