She graduated from Lincoln High School in Stockton in 2000. In her four years there, she was a three-year letter winner and played as an outside hitter and libero. As a senior, she earned All-San Joaquin League and All-Area honors. In her senior season, she had season totals of 357 kills, 569 digs, 35 aces and 40 blocks. Her high school total is 705 kills, 1,254 digs, 103 aces and 82 blocks. She helped her team to the NorCal championships in 1999 and 2000.
She played club volleyball for Nike Pacific and Delta Valley Volleyball Club, where she was named to the junior Olympic team in 1999 and 2000.
In her senior season in 2003, she dominated the libero position as she led USC to their second consecutive NCAA National Championship. She started all 35 matches and averaged 4.25 digs per game - the second-best single season performance in program history. She finished her USC career with 1,093 total digs and a 3.09 digs per game average to rank sixth in both USC career record categories. She surpassed her own career high and set a new USC record for digs in a three-game match with 31 against Stanford. On December 13 against UCLA in the NCAA Regional Final, Davis tied her career mark and USC record by posting another 31-dig performance against the Bruins. She trained with the USA A2 Women's National Team in Lake Placid, New York, during the summer of 2003.
Her happiest moment in sports was winning back-to-back NCAA Division I volleyball championships with USC in 2002 and 2003.