Amanda Peek was a member of the 1999 Week 10 Championship Glendale Knights of California. During Amanda's first two at bats of the title game, she hit the first pitches thrown at her out of the park for two home runs. She was denied a third home run, and possible shot at tying Cooperstown Dreams Park's home run record for the week (then it was 16), when the opposing pitcher intentionally walked her during her final at bat. Amanda currently holds the Cooperstown Dreams Park record for most home runs in a week by a girl with 15.

Amanda continued to play baseball, competing at the high school level at Crescenta Valley High School (La Crescenta, CA) for two years before she made the jump to softball and was named a two-time Los Angeles Daily News first team, All-Area honors twice and, during her senior year (2004) Amanda earned Pacific League Most Valuable Player and All-State accolades. Following her 2004 high school graduation, Amanda attended and played softball at California State University-Northridge (Northridge, CA) - a member of the Big West Conference. Amanda made a mark in the Division I conference the three seasons she competed (2006-2008). In 2006, Amanda, who started all 42 games, earned Big West Freshman of the Year, All-Big West first team and All-West Region second team honors. She led the team in batting (.408), runs scored (34), hits (53), doubles (14), home runs (13), runs batted in (27), total bases (108), slugging percentage (.831) and on base percentage (.470).

In 2007, Amanda was named to the All-Big West First team for the second straight year. She was named Big West Player of the Week on March 19th. Primarily a catcher, Amanda started all 47 games. She led the team in runs (32), hits (43), home runs (13), RBI (29), total bases (88), on-base percentage (.442) and slugging percentage (.688). Amanda registered a .970 fielding percentage, committing only four errors. During her final season (2008), Amanda was one of two members of the team who started all 47 games. For the third straight year, Amanda led the team in hits (51), runs (29), home runs (8), RBI (28), and total bases (86). She was named All-Big West Second team and Big West Co-Player of the Week (April 5-6).