2023-24 — Posted season bests in 50 free (24.51), 100 free (53.21), and 100 back (58.12) at Hawkeye Invite, and 200 back (2:06.05) at B1G Championships… swam a collegiate-best 1:15.42 in 100 breast at Iowa State… Academic All-Big Ten honoree.
2022-23 — Posted season bests in 50 free (24.24), 200 free (1:56.85), 100 back (57.15), and 200 back (2:04.11) at Hawkeye Invite and 100 free at Northern Iowa (55.16)… swam on three 200-free, two 400-free, one 800-free, five 200-medley and one 400-medley relay… Academic All-Big Ten… Dean’s List student (Fall 2022)… letterwinner.
2021-22 — Posted a collegiate-best 23.91 in 50 free at B1G Championships… swam anchor leg on team-leading 400-medley relay that placed 12th (3:45.85), third leg on team-leading 200-free relay that placed 12th (1:33.82), and third leg on team-leading 800-free relay that placed 12th (7:34.13) at B1G Championships… Academic All-Big Ten honoree… letterwinner.
2020-21 — Swam collegiate-bests in 100 free (52.38) vs. Nebraska, and in 200 free (1:54.14), 100 back (57.12), and 200 back (2:02.53) at B1G Championships… letterwinner.
High School — Swam at Dubuque Senior High School, where she was a two-time MVC Conference Athlete of the Year… two-time IGHSAU District Athlete of the Year… four-time all-state and all-conference selection… four-time team MVP… placed 14th in 200 free and ninth in 100 free as a freshman, fifth in 50 free and 100 free as a sophomore, third in 50 free and sixth in 100 free as a junior, and fifth in 50 free and seventh in 100 free as a senior… set school records in 100 free, 200 free, 100 back, and as part of 200-medley relay… high school Valedictorian at Western Dubuque… Academic All-American, IGHSAU All-Academic State selection and two-time MVC Conference All-Academic team member… earned the Western Dubuque Silver Chord (four years and 120+ hours of community service) and was a Senior Scholar… Student Council member and four-year senior class vice president… member of Dubuque Area Youth Leadership Council, Western Dubuque High School Spanish Club, and Hugh O’Brien Youth Leadership… high school coach was Jesse Huff.
Pfeiffer’s Collegiate Bests
| Event | Time | Meet | Date |
| 50 Free | 23.91 | at B1G Championships | 2/17/22 |
| 100 Free | 52.38 | vs. Nebraska | 1/16/21 |
| 200 Free | 1:54.14 | at Big Ten Championships | 2/25/21 |
| 100 Back | 57.12 | at Big Ten Championships | 2/26/21 |
| 200 Back | 2:02.53 | at Big Ten Championships | 2/27/21 |
| 100 Breast | 1:15.42 | at Iowa State | 12/8/23 |