Yes she is the perfect one to get him to come out of hiding, but since this is CSI and they don't like to be too obvious, alot of stuff goes unsaid. Then again what makes it to screen verses what is shot is another matter. And, they still could end the season with something very tasty like they did in season 3 with Cath & Gil hugging.
So, like any good story, they give just enough and leave the viewers wanting for more. So in the meantime, we amuse ourselves and that's not so hard to do.