It all depends on what your specific goal is, from your description you just want a quick trim?
I actually haven't trained any female athletes however the basic principles of diet will still apply
1. As a woman you do not produce enough testosterone to build huge muscles without being enhanced, sure you can trim fat back and be toned underneath which can give you a muscley appearance but you will not become Arnie Mk2.
2. Supplements are simply to supplement your dietary needs - keep them to a minimum food should cover as much of your nutritional need as possible. To work out how much of a supplement you need, you need to know what your dietary macros,
This figure will be based on your weight and goals. As an example, off season i weigh in at 180lb - my calories work out at 2700 for lean a bulk comprising of 45% protein 40% carb 15% fats <-- these are the Macros. When i come to show prep I need to be in a calorie deficit so my calories slowly move to 2100 and my coach adjusts my macro's. training will continue as usual. the key here is consistency.
The only supplements I use during prep are a good multivitamen, chordomax (from healthspan) and a good Zinc and Magnesium (ZMA supplement) plus a good preworkout. All my macro's are currently hit with basically chicken, lean beef, white fish, basmati rice and sweet potato with 1 cheat meal a week.
In essence, supplements are not necessary. Keep the food natural and clean, weigh the portions, keep the training intense and the results will soon speak for themselves.
Hope that helps, feel free to email me if you have any questions