I don't think you'll find anything that will suck her up by Saturday. Adding pickle juice to their diet helps dry them up, it basically dehydrates them a little. Dex works also but I don't think I would use it for that. I know some folks that have used it with good results but I never have and don't believe I ever will.
i wouldnt recommend it in this heat, thats a dead dog then
only thing you can do is run her, and put a ace bandage on her and there ya go