hey missy, i ride a twin tip 128, naish pro board and i have a younger sister who is 50kgs and about ur height and we just bought her a misfit 120 airush board, you can choose to ride any board that is right for you, if your about 166cm tall, a board that sits just below your arm wen extended is about rite.
the misfit 120 is about 38 wide aswell so theres alot of surface area.. male/female boards do not really matter, but the ones designed for females are obviously better suited for women riders, but most women ride wateva men ride to behonest...
hope that helps cya out there