User blog comment:Zathronas/Analysis by an author: Volume 2 episode 11: No brakes/@comment-78.42.186.25-20141024022917/@comment-24218038-20141024125333

We'll see Penny in the final episode but I'm gonna go on a limb and say it will be impossible to reproduce her... or exceedingly difficult.

My theory is that she has the brain of her crestor's daughter who died. This would make her unique.