I second the thrift store. If you don't find anything there, buy some floral fabric and tie a sarong (no sewing required). Pair it with a lei and brightly colored top for a cute and tropical look.
I would try a thrift store for a Hawaiian shirt that can be worn over a tank top and skirt. If you have time you can order something online from Hilo Hattie (as suggested) or even eBay. There are even Disney themed aloha prints.
I'd try a thrift store, or bright colored tshirts from Target/Old Navy. Floral fabric for a sarong over the tshirt and shorts. Micheal's Craft Store ususally has lei's, straw hats, etc.
Add flipflops and a flower in her hair. Couple it with a lei or shell necklace. Look at a party store or Oriental Trading Co for a grass skirt. I agree with hitting Goodwill for Hawaiian print shirts. She can always tie it in a knot at the waste and wear it with jeans or shorts.
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