I agree with the above poster-- choose a theme first. A spa theme might be fun. Or maybe a movie night, a "night under the stars," a candyland party, or a tropical party.
Spa party- give the girls manicures and facials, and do their hair. You could even have a little fashion show. For dinner serve sandwiches or pizza. Serve smoothies and chocolate covered strawberries. For a craft you could make lip gloss or decorate flip-flops, sunglasses, or purses. Serve home made waffles or pancakes with fruit for breakfast. For decorations, use lots of candles, feather boas and streamers. You could even use shower curtains to divide a room up into manicure, facial, and hair stations.
Movie Night- serve pizza or hot dogs for dinner. Set up a room like a movie theater. Serve popcorn and candy as snacks. Maybe you could even have a little award show or have the girls make their own movie.
Night under the stars- they could either camp outside or inside. For dinner, cook hot dogs and hamburgers. Roast marshmellows, tell camp fire stories, have a scavenger hunt. Play games such as cherades. If you are inside, hang stars on the ceiling.
Candyland party- decor- make it look like you are floating in the clouds- pink cotton candy clouds that is. Fill the party room with balloons, pink rugs, stuffing, etc. Make large candy garland- put two bowls together and wrap them in colored celophane (twist the ends of the celophane so that it looks like old fashioned candy), make more of these in different colors and attach them with ribbon, then hang the garland over a door. Make giant candycanes out of some kind of flexible tubing and make giant loli pops. Make cotton candy, have a chocolate fountain. You can buy candy necklace kits for a craft or make a candy houses. Have lots of candy everywhere. For dinner, try to come up with food that looks like candy, for example, maybe you could put pink foodcoloring in mashed potatos so that it looks like cotton candy(I have never tried this, so I don't know if it would actuallywork!

).
Tropical party- decorate so that the room looks like a beach. have a hula hoop contest, build mini sandcastles, decorate flip-flops, serve tropical food and drinks.
Good luck and have fun!!!!!