The overall Figure winner at the NABBA World Championships was between 6-7%, and she was shredded - you could see the muscles in her face. Is your friend competing? If not, I would advise adjusting her expectations a little.
You can do it naturally - it helps if you're genetically predispositioned to be lean; Cherie (the winner) maintains 12% bodyfat offseason. It will be quite hard if you don't have the "lean" genes, and you probably won't get it your first diet cycle. It takes lots of practice and several diet cycles before you figure it out. I'm still working on it; I just broke into the 8 percentile finally with my last diet phase - need to figure out how to get down into the 6-7 percentile for next Worlds. And yes, I'm a natty.
As far as ephedrine, pre-contest I use 25 mgs edphedrine hcl stacked with 200 mg caffeine taken 2-3 times daily (depending on how early I rose). I can't take it after 3:00 pm or I won't sleep.