| Final | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Isabella Bishop | 13 | Rushden | 46.59 |
| 2 | 2 | Orna Lett | 13 | Daventry | 43.28 |
| 3 | 3 | Evie Reamsbottom | 13 | Daventry | 42.96 |
| 4 | 4 | Alice Wallinger | 13 | Wellingboro | 40.97 |
| 5 | 5 | Grace Faulkner | 13 | Corby | 41.66 |
| 6 | 6 | Hannah Marsden | 13 | Daventry | 43.23 |
| 7 | 7 | Mia Allan | 13 | Northampton | 46.37 |
| 8 | 8 | Kaia Dawson | 13 | Corby | 46.99 |