You need to determine what it is in her theory with which you disagree, and then determine what it is you believe to be true. Your opinion, however, is worthless if you cannot prove it with facts, statistics, and etc. In addition, you will need to find other, peer reviewed materials that support your theory. If those sources are out there, wonderful. Don’t forget, however, that you will probably have to contradict others who support Dr. Sandra Scarr. Just because you disagree, or others disagree, this does not mean you are correct. You cannot ignore the valid support of her work (if it is out there). It is possible that you and she both have valid points to make.