Since her handle is gymgirl, she is already on a bodybuilding forum, and on a diet I think I'm probably correct in making the assumption that a) Shes already "not eating crap" and b) shes "Go(ing) to the gym".
Don't eat crap and go to the gym might only be good advice for obese people who are sitting at home watching opera and snacking on twinkies. It's sometimes dangerous as I once told my friends roomate when she asked me for advice to get in shape. "Be more active, stop eating stuff like pizza, burgers and fries and instead eat more whole grain bread, rice, chicken, fish, ect." I didn't get into details.
A month later I saw her again and she was mad at me "I thought you knew your stuff - I followed your advice and actually GAINED weight!". I asked her to run down for me exactly what she had been eating, and she had been muching down on Chicken fried rice, fish and chips, and huge bowls of pasta with bread and butter. I asked why on earth she put butter on the bread and she said 'because the whole grain bread is too bland'.
The reason why I say to get 'scientific' is because while someone who is obese can basically just eat 3 less chocolate bars a day and lose weight, those who are already at a respectable bodyfat and trying to get ripped would really benefit from having a log of what they eat and seeing where the extra calories are coming from. Know what your body requires, then you can modify your diet to get the result you want. Plus tracking calories I promise there will be many times when you are like 'wow I never realized there was that much fat in X'. or "omg I could have sworn I didn't go over my fat allowance today!"