Ritter saw limited playing time as a freshman, only getting 7 decisions for a 5-2 record. Debuting on February 15, 2003, Ritter got a no-decision, pitching 5-innings, giving up a run and striking out 9 vs. the San Diego State Aztecs. She made her second appearance in the NCAA Regionals, shutting out Wright State for three innings to collect her last win that season.
In 2004, Ritter earned All-Big Ten honors after posting 24 wins and 269 strikeouts, of which the latter ranked second all-time for the Wolverines. Ritter fired her first career no-hitter on March 12 against the Notre Dame Fighting Irish. She was a hit batter away from a perfect game.
Ritter had a golden season as a junior, earning All-Big Ten and National Fastpitch Coaches' Association First Team All-American honors. She was named conference "Pitcher" and "Female Athlete of The Year" to go along with USA Softball Player of The Year and University of Michigan's "Female Athlete of The Year." She threw three no-hitters and a perfect game on April 17, 2005 vs. the Indiana Hoosiers. She also broke and set the school records for wins and innings pitched. Her strikeouts and shutouts still rank top-5 all-time for a Wolverine season. She also won a Big Ten pitching Triple Crown for the best win, strikeout and ERA totals.
Beginning on February 12 - April 19, Ritter went on a career best 22 consecutive game win streak, eventually snapped by the Penn State Nittany Lions on April 22. On May 4, Ritter punched out 16 Western Michigan Broncos in a two-hitter for her career single game regulation best.
Ritter would lead the Michigan Wolverines to the No. 1 seed at the Women's College World Series and opened her first and only appearance with a shutout of the DePaul Blue Demons. After escaping elimination, Ritter led the way into the Championship Finals against defending champs, the UCLA Bruins. Ritter toughed out a 10-inning battle in the third game of the finale series to win the National Championship and the distinction of being the first team east of the Mississippi River to accomplish the feat. She also earned All-Tournament Team honors for her 5-1 record and 60 strikeouts in 54-innings (then a new series record).
Ritter's senior season saw her repeat all-season honors: All-Big Ten, First Team All-American and Michigan "Female Athlete of The Year." She threw a no-hitter and broke her own record for strikeouts and strikeout ratio (11.6); her shutouts were also a new record, the strikeouts totals remains tops for a single season. Ritter also posted her best ERA and WHIP to accompany a pair of top-5 records for innings and wins at Michigan, helping to earn her a second conference Triple Crown.
On April 15 in a 1-0 loss to the Iowa Hawkeyes, Ritter struck out her 1,000th career batter. In a win over the Michigan State Spartans on May 6, Ritter began a career best 45.2 consecutive scoreless innings streak that was broken on May 21, when she broke the school record for single game strikeouts, whiffing a career best 19 in Regional action against the Oklahoma Sooners. During the streak, Ritter won all 8 games and struck out 76 batters, surrendering only 12 hits and 7 walks.
Ritter would graduate as the all-time Michigan Wolverines record holder in strikeouts, shutouts, WHIP, innings pitched and strikeout ratio. As well she also put up some of the best wins and ERA numbers all-time for the Wolverines. She currently still holds the records for strikeout ratio and shutouts. She is also the strikeout ratio leader for the Big Ten Conference at 10.1 and ranks top-10 in almost every other pitching category. Ritter is also a top-20 strikeout ratio pitcher all-time for a career in the NCAA Division I.
Ritter was selected to the National Team in 2007 and competed at the World Cup and Pan American games. She had previously been named to the USA Elite in 2005.
She currently performs training camps for youth and works for the Big Ten Network (color commentary) during the softball season.
On February 15, 2006, Ritter was selected 6th overall in the National Pro Fastpitch draft by the Akron Racers. Ritter however joined and continues to play on the PFX Tour where she was originally drafted fourth overall.
Ritter was chosen as one of the University of Michigan's all-time top athletes by Sports Illustrated Magazine.NCAA Division I softball career strikeouts list
NCAA Division I softball career sub-1.00 ERA list