She is still a virgin. All this means is now that she's fed from somebody she's a true vampire. So not only was she turned by a the most powerful vampire ever who had already been modified to hax levels by Hellsing, thereby no doubt giving her some sort of hax powers, but her first feeding was an experienced military veteran so she has serious combat know how.
As for her virginity... it doesn't really matter once you've already been turned. Afterwards it's not like you'll suddenly turn into a ghoul if your hymen rips, or in a male vampire's case if you bust a nut on your victim's tits.
I'm sure she's already summoned Pip's familiar form to penetrate her good'n forceful... but does it really count when it's like that?