No offense to the great Patricia Tallman, the fantastic actor and stunt person largely known for her work on Babylon 5 as well as the 1990 remake of Night of the Living Dead. The wide eyes just seemed an odd choice.
Also Patricia Tallman:
Fun fact: Patricia Tallman plays more characters in TNG era Trek than Jeffrey Combs.
My DS9 is rusty, but I think most people were expecting it to fail or go boom. So the portrayal here might have been meant as a “huh, we didn’t blow up” type of reaction.
This takes place before they confront the Klingons, so all systems are presumably nominal. Chalk it up to nerves, I guess.
She’s thinking of the Pegasus and tapping the console with crossed fingers.
The cloak isn’t effective if they can read your minds. Making that face helps block the Vorlons from sensing them.
Not an extra, extras don’t have lines, they are just animate props whose photos were picked from a pile. This is a bit part played by a real actor who auditioned.