There are various styles, but try a hairstyle which is less glossy and cheek and more towards a natural and original look. This will help them to sparkle on the event by staying in the boundaries of their age.
The best and the easy hairstyle which will not only help them in keeping themselves in fashion, but they will also remain in the comfort zone is the beach hairstyle. With the cascade curls teenage girl will be able to present an innocent and cute look. You can make it more beautiful by using hair accessories like headbands and flowered clips.
If the teen prefers to have an elegant look, which can compliment her gown then she can go for chignon hairstyles. This sort of hairstyle is yet again another beautiful look which can be assisted with different hair accessories like clips and flowers.
The most simple and a casual hairstyle, which is not only simple but comfortable to carry as well, is a high or low ponytail with swept bangs. This look can be made more extraordinary with ribbons or head bands.