Fomori are good prospects if you are looking for a troll that is attractive by human standards, because they don't have the dermal deposits, and are not as large as normal trolls. I think they could be attractive to humans with the same kind of augmentation a human would get (clean metabolism, silky skin, perhaps things like a vocal range enhancer or tailored pheromones). They would still be noticably trolls (arms longer in proportion to a human's, built on a more massive scale, horns and tusks), but would be attractive to everyone except bigots.
Going beyond that (trying to look like a seven-foot human) would take a severe biomod, and would put the character in a precarious situation. Humans finding out she's really a troll would become hostile, and trolls finding out she's a troll would consider her the worst kind of sell-out. And she still might get less positive attention than the attractive troll - instead of being a glamazon, she would probably wind up in "uncanny valley", and make people nervous. Personally, I would recommend making the character attractive, but still noticably a troll, as a much more viable option.