how adorable! i love the outfit and the shoes your planning! for the hair i would go glitter! a stretchy glimmer ribbon or baby blue ribbon with sparkles--make a few layers of red,white,blue, for her bow and in the middle of it all add a big heart--sew it all onto the ribbon so it doesnt fall off-if she has enough hair make 2 mini pony tails and add tons of curls
you know the other pageant moms are going to go crazy with the oufits so try to add maybe a sparkle or 2 for her performance( if they allow it
or a glow stick would work shape them into a U.S.A. --and have fun, lots of smiles and kisses! GL!