If she were not, she wouldn't have coached Tennessee to six NCAA women's basketball championships and have the Lady Vols in the Sweet 16 of the tournament for the 20th year in a row. Right now, Summitt is directing her psychological messages at two targets. One is her entire team. The other is her 6-foot 5-inch center Michelle Snow, who has twice gained some notoriety by dunking in games. As the tournament moves to neutral courts for Saturday's regional semifinals, the top-seeded Vols (31-2)