I felt she was very reserved in the pilot, and even when she was beating Penguin it was more about beating the crap out of him because he was a rat. I think alot of the flack Mooney gets is in the second episode where at times she was reminiscent of Eartha Kitt and the moment she was upset about what happened to her boy toy. For someone so calculating and someone who would never let you see her sweat , it was quite a jarring change from the pilot. Now , if they had made the point that she may be tough but she did have a weakness that Falcone was able to get to I could have gone along with it. However in the next episode she returns to being calculating and tells her thug to just get rid of boy toy. I mean, I get that her original anger was more about Falcone attempting to humiliate and show his dominance over her, and that there was nothing she could do about it , but that shift in the third episode seemed more like the writers may have felt she was a bit too over the top in her reaction in the previous episode. In Balloon man and Arkham ,she seemed more consistent to me with the pilot than the second episode.
They're still clearly working out the kinks. She's a brand new creation so they don't really have any frame of reference with how to write her character. I do think that they are trying to determine whether she's sort of the Betty Davis calculating vamp or whether she's a more larger than life Eartha Kitt precursor to the eccentric baddies gotham will face. I think its what happens with most shows starting out. They're still trying to find the character I think.