Don't know much about competitive swimming - can you include her stats -- sounds like she's looking possibly for more power and endurance? Also include her meal plan. For a "typical" person who doesn't follow a clean diet, a good "cleansing" diet (same idea as cleaning out all the crap built up from stuff like too much grease by eating a diet for a week or two rich in things like freshly juiced vegetables, letting the natural enzymes clean things out) will do wonders for providing "more energy" due to a more optimal system -- kinda like putting "Slick 50" in your gas tank.
If she already eats clean, I would check the protein levels and also the carb levels to provide enough fuel for strength and also for energy. I DON"T do much with sprint-style activity so my carb needs are much different.
Beyond that, what other supps is she looking at? There is the usual stuff ephedrine, thermogenics, etc. As far as "serious supps" it always sounds like winstrol is the AS of choice for performance. I dont' know so much for women, but it was Ben Johnson's poison of choice and a friend of mine wanted to do a cycle to help his performance in competitive mountain biking.
Ladies -- any other suggestions?