Don't know if I'm seeing the "true colors" on my monitor but here is my two cents worth. If she wants primary, how about the blue you have followed by yellow instead of the light, ending with a red that complements the colors you have already. Very cute quilt and I see primary colors in the pictures she has.
And, welcome to the board-I'm sure you'll get lots of opinions and ideas as more people see your post. Good Luck.