Queen Bee Syndrome

"Queen bee syndrome was first defined by G.L. Staines, T.E. Jayaratne, and C. Tavris in 1973. It describes a woman in a position of authority who views or treats subordinates more critically if they are female. This phenomenon has been documented by several studies. In another study, scientists from the University of Toronto speculated that the queen bee syndrome may be the reason that women find it more stressful to work for women managers; no difference was found in stress levels for male workers. An alternate, though closely related, definition describes a queen bee as one who has succeeded in her career, but refuses to help other women do the same." (Wikipedia)

More info..

Bad female boss? She may have Queen Bee Syndrome
Taking the Sting out of 'Queen Bees' Who May Be Out to Get You