| # | Swimmer | Team | Seed | Time | Diff |
| 1 |
Pelaez, Erika (11)
|
UNAT |
58.30 |
58.58 |
0.28 |
| 2 |
Balzano, Luna R (12)
|
FGMSA |
1:07.30 |
1:03.28 |
-4.02 |
| 3 |
Reveron, Victoria (11)
|
FGNMST |
1:07.50 |
1:08.77 |
1.27 |
| 4 |
Kline, Anna R (11)
|
FGMSA |
1:18.78 |
1:12.89 |
-5.89 |
| 5 |
Villar, Ariadne M (11)
|
FGCANE |
1:10.76 |
1:13.89 |
3.13 |
| 6 |
De La Cruz, Sophia J (11)
|
FGNMST |
1:17.08 |
1:17.54 |
0.46 |
| 7 |
Walsh, Madison C (12)
|
FGCANE |
1:27.18 |
1:18.21 |
-8.97 |
| 8 |
Cerda, Eva S (12)
|
FGCANE |
|
1:21.88 |
- |
| 9 |
Aldabe, Camille E (12)
|
FGMSA |
|
1:25.92 |
- |
| 10 |
Corral, Natalia M (11)
|
FGCANE |
1:27.21 |
1:33.41 |
6.20 |
|
Schechter, Camille S (12)
|
FGCANE |
1:03.40 |
NS |
- |