| Final | |||||
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 1 | Freya SHARPE | 12 | Lincoln Vulcans SC | 48.02 |
| 2 | 2 | Ava MALLOWS | 12 | Louth Dolphins SC | 47.74 |
| 3 | 3 | Jessica HALL | 12 | Grantham SC | 47.08 |
| 4 | 4 | Molly CRAUGHAN | 12 | Lincoln Vulcans SC | 45.94 |
| 5 | 5 | Emily TALKES | 12 | Lincoln Vulcans SC | 46.38 |
| 6 | 6 | Isla LORMOR | 12 | Gainsborough Dolphins SC | 47.39 |
| 7 | 7 | Lucy ABBOTT | 12 | Grantham SC | 47.98 |
| 8 | 8 | Olivia KING | 12 | Deepings SC | 48.47 |