there's no rule saying it has to cover all of her arms & legs - the legs of both of the tri wetsuits i've owned have had to be pulled up to mid-calf height in order to fit, and my old suit's sleeves had to be hiked up well above my wrist.
i'd rather have exposed wrists and ankles and a suit that fits well than worry about extremity coverage and have a suit that lets in a bunch of water. heck, with my new suit my chest actually stays dry unless i purposely let water in through the front of the neck!
another option: look at a suit made for men. the torsos may be proportionally slimmer.
__________________________________________________________ ill advised racing inc.