I started out at 35lbs and moved up now to 50 lbs. If she not use to using those muscles it best to start small and move up. Also then she dooesn't have to worry about injuring herself. I ended up not hunting a season because everytime I pulled my string back it hurt and that was at 35 lbs. So good advise YooperMike and there is many bows out there that allow you to grow with them, that's really nice.
I would also like to know where I can get me one of theses boyfriends that buy there girlfriend hunting equipment?