Records
8 Advance: Top 3 Each Heat plus Next 2 Best Times
| Place | Name | Age | Team | Prelims | H. |
|---|---|---|---|---|---|
| 1 | 395 Annalese Zhao | Ku-Ring-Gai | 41.30Q | 2 | |
| 2 | 6618 Emma Felsman | Manly Warringah | 42.26Q | 1 | |
| 3 | 6624 Emilia Carlon | Manly Warringah | 43.00Q | 2 | |
| 4 | 868 Arabella Brown | Ku-Ring-Gai | 43.69Q | 1 | |
| 5 | 762 Emma He | Ku-Ring-Gai | 43.63Q | 2 | |
| 6 | 15467 Lucinda Kinsey | Hornsby | 44.65Q | 1 | |
| 7 | 6490 Claudia Blowers | Manly Warringah | 44.10q | 2 | |
| 8 | 6536 Claudia Leslie | Manly Warringah | 45.61q | 2 | |
| 9 | 15720 Estelle Platcher | Hornsby | 47.58 | 1 | |
| 10 | 590 Ariana Lalji | Ku-Ring-Gai | 49.32 | 2 | |
| 11 | 14816 Priya Nair | Mosman | 49.37 | 2 | |
| -- | 512 Eleanor Ruff | Ku-Ring-Gai | DQ | 1 | |
| -- | 6421 Indiana Lanza | Manly Warringah | DNS | 1 | |
| -- | 15491 Jaclyn Lau | Hornsby | DNS | 1 |