| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:17.92 | 2021-12-12 | |
| 100m Breaststroke | 1:18.04 | 2025-01-19 | |
| 100m Freestyle | 1:05.72 | 2021-12-11 | |
| 100m Medley | 1:43.65 | 2016-02-27 | |
| 200m Breaststroke | 2:51.49 | 2025-01-19 | |
| 200m Freestyle | 2:28.46 | 2024-01-21 | |
| 200m Medley | 2:48.42 | 2024-01-21 | |
| 400m Freestyle | 5:39.81 | 2023-04-02 | |
| 50m Backstroke | 35.20 | 2023-02-24 | |
| 50m Breaststroke | 36.48 | 2025-01-19 | |
| 50m Butterfly | 33.72 | 2021-12-11 | |
| 50m Freestyle | 30.84 | 2021-12-11 |
Pettypiece, Grace's top personal bests include 100m Backstroke (1:17.92), 100m Breaststroke (1:18.04), 100m Freestyle (1:05.72), 100m Medley (1:43.65), 200m Breaststroke (2:51.49).
Pettypiece, Grace swims for Brock University.