Records
8 Advance: Top 3 Each Heat plus Next 2 Best Times
| Place | Name | Age | Team | Prelims | H. |
|---|---|---|---|---|---|
| 1 | 7067 Lexi Collins | Manly Warringah | 18.32Q | 2 | |
| 2 | 395 Annalese Zhao | Ku-Ring-Gai | 19.75Q | 1 | |
| 3 | 762 Emma He | Ku-Ring-Gai | 19.77Q | 1 | |
| 4 | 792 Millicent Foster | Ku-Ring-Gai | 20.60Q | 2 | |
| 5 | 512 Eleanor Ruff | Ku-Ring-Gai | 19.80Q | 1 | |
| 6 | 14819 Macarena Seldner F | Mosman | 20.68Q | 2 | |
| 7 | 6624 Emilia Carlon | Manly Warringah | 19.95q | 1 | |
| 8 | 7199 Charlotte Roberts | Manly Warringah | 21.86q | 2 | |
| 9 | 960 Giselle Wong | Ku-Ring-Gai | 21.89 | 1 | |
| 10 | 6536 Claudia Leslie | Manly Warringah | 22.07 | 1 | |
| 11 | 14781 Charlotte Jones | Mosman | 22.98 | 2 | |
| -- | 6421 Indiana Lanza | Manly Warringah | DNS | 2 | |
| -- | 21679 Chloe Person | Northern Districts | DNS | 2 |