Helen is a member of the anti-Pirate squad, although not a particularly assertive or noticeable one. She is described as long and lanky and not very attractive at first glance, but with an appearance that grows on people.
The one thing Helen excels at turns out to be very useful after the Celestial Omnibus is captured, and that is cooking. She manages to infiltrate the kitchens in a quiet way, and begins, with the help of some apologetic cadets, turning out delicious meals.
In this, she's up against a traditionalist, Brother Milo of Maintenance Horn, who is not exactly hidebound but who feels it his duty to resist any attempt to seduce him. Helen makes no such attempt but succeeds at it anyway. It's a nice pairing.