Other than keeping from over training and possibly keeping joint and other injury inflamatin down, I can't really see her taking the juice for any other reasons as her physique didn't show much more than a fit level of developement. At least in the pics I saw.
But I have to say in the one pic I did see I couldn't help to think of Gargamel from the old Smurf cartoon.
Yes! Female tennis players juicing. What next? Badminton and Ping Pong?
Chess players no doubt.... PT'd by swolepuss. ^ The Happy Trainer who likes to "watch" people and ends up being watched himself....