20mg of var is the high end dosage for women. Many recommned 2.5mg a day to begin with, then bump up to 5mg a day. Many women max out at 10. If she's going to start out taking 15mg a day of something she's never used then she's asking for trouble. She needs to join here, post her traini g diet and goals and do some mega research before she decides she's going to use anything. Additionally, regarding price: Even at $60 per month if you go with 10mg per day at your cost calculations, that's not very expensive for a product that's safer for HER to take.
I'm really not trying to sound like an a-hole or anything, but she really needs to make sure she understands all the potential sides. She needs to be researching and asking questions herself if she's serious.