After the end of the first season, when viewers were brought to tears of happiness via how the story of Rusty ended with him being an official orphan - her calling him a "Whorphan" was not endearing.
That Rios was also somehow finding her way into other crimes outside the Stroh case and bumping heads with pretty much everybody - and with a damned annoying attitude to boot - was a recipe for disaster. Even Chief Taylor had to read her the new rules of major crimes when it comes to getting convictions (i.e., making deals!) versus putting people on trial. The girl had ants in her pants and I just wanted to shake them out of her.