She attended the suburban PittsburghWest Mifflin Area High School, where she played basketball and soccer. She led the team to the W.P.I.A.L (Western Pennsylvania Interscholastic Athletic League) basketball district finals in her junior year. The team lost a close game 81-78 to Blackhawk High School in Triple Overtime. Tanisha fouled out in the beginning of the final overtime. She led the game with 51 points. She went on to lead her team to the next seasons finals once again against Blackhawk, where she led the team in a 63-53 victory. She went on to take her team to the state finals, where they lost a close game to Allentown Central Catholic high school 56-45. The team's record was 31-1, their only loss coming in the state finals.