Dolphin and Marrina

I always wondered why more was not done with Dolphin as a character.  She eventually joined Aquaman's cast as a love interest for Aqualad, but even then she never really made a splash, if you'll pardon the pun.  I remember being kind of intrigued with her as a kid - but maybe that's just because she was a hot chick in cut off jeans and a wet t-shirt.