How is Tricia McMillian described in the novel, Mostly Harmless?

Tricia is described as pretty... the perfect anchorwoman. It is hinted that because of her look, some people perceive her as lacking in intelligence, but in reality, she has a prestigious degree in mathematics and a doctorate in astrophysics. Adventurous, Tricia happily travels with the aliens, proving herself to be courageous, easily bored, and somewhat fragile.