Take her to the fabric store, when she gets there she will be better able to make choices on what is available.
OR. Check out the pattern by blue meadow designs called ASTORIA. Maybe instead of white background she could choose similar light greens as a background (you could actually mix greens and do YBR or similar), blues as sashing and/or
Boarders and do a greyed appliqué, like the Astoria pattern over the greens. I think you could get a similar effect to the wallpaper.
Happy customer of blue meadow designs, the have such nice modern patterns, very appealing to the younger persons