Just to reiterate, all these suggestions are great. However, taking all these suggestions and formulating a periodization training schedule will be the only thing that will work besides the over eating. Personally, when I was doing Max-OT ages ago (till I learned better), my biceps were stuck at 18". I have since found that my arms respond better to a higher rep range..6-10. Give her a try. Currently at 19" as per my tape measure picture....Don't listen to Peter Pumpkin Eater on that topic though!