Yes, villains are very much available and welcomed! She would likely fall under the Miscellaneous Villains category within which there remains unlimited space. Quantum is presently the 'big cheese,' so to speak, and we are making an effort to do away with the Cold War stereotypes by encouraging cooperative efforts from former adversaries. At the same time, we have no illusions about there being some utopic world peace.
To put simply, yes, we can definitely accommodate your character. :) If you could get back to be with a PB, I can certainly hold a spot for you.