Interesting. Now that I think about it, the sort of "tough cookie" female characters on the show: Carolyn, Julia, Angelique, Eve, and to a degree, Elizabeth, are all written with a comfort level to zing their unsavoury male and female adversaries, while indeed, Victoria responds to such elements with a standard "deep freeze" haughtiness. What gave her a rare chance to be dicey in so few fleeting moments were Vicki's lapses of concentration; when she'd become simply exasperated, forget her manners, and just snap (she took David & Roger to task several times in that first year as the new governess):
Vicki (to Cassandra): "You deserve a whole lot more than just a slap in the face!"
Vicki (to Nicholas): "...[you appeared] as if we had to have some eye of evil constantly staring at us!" "You're not human!"
For a girl who went toe-to-toe with both a witch and a warlock, Vicki deserved to be let in on more of the real goings-on at Collinwood and The Old House, but that reality might have hardened her spirit. Maybe her haughtiness was to give her character the ongoing hope of becoming humbled in her enlightenment. Characters like Julia and Eve had already been around the block and weren't dropping the chips on their shoulders over the next dashing vampire who summoned them into his web.