I was just at Target today and in there was an ENTIRE row of really cool wall decals. They come in a tube with several stickers all in a theme with ideas about how to arrange them. I think flowers on blue walls (maybe with white clouds or little birds or butterflies) would be SO cute for a baby girls room.
You could also get the white wooden letters (or buy the natural wood ones at a craft store and paint them however you want... even white... I think they are less expensive than the prepainted ones) and hang them using pretty ribbon tied in loose bows tacked to the wall.
Whatever bedding you get for her, you might also get the window valance, and a throw pillow to put on the rocker, and that will pull the girlie around the room.
Good luck with everything. Enjoy your little girl.
T.