My girlfriend is concerned about one breasts being larger than the other?

Basically just over two years ago she went on a "crazy" diet, and became anorexic, though she has a completely normal eating habit and it a healthy weight now, it has been evident that one of her breasts is larger than the other and it has been put by the doctor that it was due to the amount on weight loss that she exceeded. What can be done without surgery to correct this problem as it's making her feel extremely self conscious.