| Final | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Rosie Loudoun | 11 | Wareham | 43.30 |
| 2 | 2 | Daisy Kirkpatrick | 11 | Wareham | 42.37 |
| 3 | 3 | Poppy Collins | 11 | Poole | 38.77 |
| 4 | 4 | Daria Korotkova | 11 | Poole | 38.03 |
| 5 | 5 | Layla Wareing | 11 | West Dorset | 38.59 |
| 6 | 6 | Aimee McLean | 11 | Poole | 42.18 |
| 7 | 7 | Theia Bull | 11 | Poole | 43.05 |
| 8 | 8 | Katrina Schmidt | 11 | West Dorset | 43.37 |