Help my wife ... please

I finally convinced my wife to hit the iron and she is really impressed by the fitness models. My wife is very muscular already (a la Serena Williams) and is concerned that she will bulk up too much. Her main goal is to reduce bodyfat to show her muscularity. She used to be a sprinter also. I was hoping some of you thirty-something ladies could offer a beginner' s workout and diet plan/link that would help her get started. Thanks everyone!