To be honest, you really shouldn't have to do much at all for a figure competitor, especially for one whose competing for the first time. If she's lean enough and knows how to pose, that's really all that matters at this point.
Carb manipulation isn't going to make a HUGE difference. If she's depleted alot and looks flat/stringy, then I would just get some carbs back in to her
slowly, starting before Friday night with small amounts of carbs (maybe every other meal starting Friday morning) and using ONLY carbs that her body is used to taking in. Have her POSE for 5-10 mins every time she eats carbs right after she eats.
Don't do anything major since you haven't been prepping her all along and since you are not sure what to do. Dropping her water the night before the show is fine...that, when combined with some natural diuretics over the course of a day or two (dandelion, cranberry extract, Expel, Teraxatone, for example) should be plenty for a figure competitor IMO.
For her first show, it must be a local/regional show, and figure competitors shouldn't need to be hard as nails and dry to the bone for these kinds of shows. She should just focus on getting herself stage ready and making sure her posing and presentation is as good as it can be, because anything else you do between now and then won't make a big difference in terms of making her look better, but could make a big difference in terms of making her look worse.
Sucks about her trainer...not cool!
Good luck.
