Hi,
I think the first step is to start with a net canopy for her bed. They make the cutest ones ever anymore. I've also seen a plain white one that a mom or dad has glue gunned flowers to it. I have a two year old and she is so girly, more than I ever was! I love the shabby chic look, too. Old with the new! Great finds at Target, garage sales, and even salvation army stores. Oh yeah, Hobby Lobby, too. A girly room should also resemble who she is. Lots of pink and pretty lace, antique knick-nacks, a big fluffy rug always makes a room, too. Well, good luck and I hope that it turns out great for your little princess.
Sincerely,
T.