| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:27.54 | Maverick Madness 2026 | 2026-01-30 |
| 100m Breaststroke | 1:41.45 | Sandy Ferris Age Group Food Bank Challenge 2025 | 2025-12-19 |
| 100m Freestyle | 1:14.88 | Sandy Ferris Age Group Food Bank Challenge 2025 | 2025-12-19 |
| 200m Breaststroke | 3:30.90 | 2025 KSC SC Invitational | 2025-11-21 |
| 200m Freestyle | 2:49.21 | Sandy Ferris Age Group Food Bank Challenge 2025 | 2025-12-19 |
| 400m Freestyle | 5:56.20 | Sandy Ferris Age Group Food Bank Challenge 2025 | 2025-12-19 |
| 50m Backstroke | 39.86 | Sandy Ferris Age Group Food Bank Challenge 2025 | 2025-12-19 |
| 50m Breaststroke | 46.49 | Sandy Ferris Age Group Food Bank Challenge 2025 | 2025-12-19 |
| 50m Freestyle | 33.85 | Sandy Ferris Age Group Food Bank Challenge 2025 | 2025-12-19 |
Gathercole, Mya's top personal bests include 100m Backstroke (1:27.54), 100m Breaststroke (1:41.45), 100m Freestyle (1:14.88), 200m Breaststroke (3:30.90), 200m Freestyle (2:49.21).
Gathercole, Mya swims for Killarney Swim Club.
Gathercole, Mya has competed in 4 meets.