| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:12.00 | Western Region Short Course Championships | 2026-02-12 |
| 100m Breaststroke | 1:21.58 | Western Region Short Course Championships | 2026-02-12 |
| 100m Butterfly | 1:26.05 | 2025 MMST Dash 4 Cash | 2025-10-18 |
| 100m Freestyle | 1:07.63 | Western Region Short Course Championships | 2026-02-12 |
| 100m IM | 1:17.41 | 2025 MMST Dash 4 Cash | 2025-10-18 |
| 200m Backstroke | 2:33.04 | Western Region Short Course Championships | 2026-02-12 |
| 200m Freestyle | 2:31.50 | 2025 NYAC Cup | 2025-11-14 |
| 200m IM | 2:39.97 | Western Region Short Course Championships | 2026-02-12 |
| 400m Freestyle | 5:26.72 | 2025 NYAC Cup | 2025-11-14 |
| 50m Backstroke | 32.82 | Western Region Short Course Championships | 2026-02-12 |
| 50m Breaststroke | 37.35 | Western Region Short Course Championships | 2026-02-12 |
| 50m Freestyle | 29.26 | Western Region Short Course Championships | 2026-02-12 |
| 800m Freestyle | 11:02.39 | 2025 Murray Drudge Invitational | 2025-12-05 |
Thiessen, Leonora's top personal bests include 100m Backstroke (1:12.00), 100m Breaststroke (1:21.58), 100m Butterfly (1:26.05), 100m Freestyle (1:07.63), 100m IM (1:17.41).
Thiessen, Leonora swims for Club Warriors Swimming.
Thiessen, Leonora has competed in 8 meets.