The Dubbo College South Campus swimmer was only just pipped for first in the sprint race, touching the wall in 28.12 seconds, just 0.04 of a second behind the winner.

"I was a bit surprised because I went into the race ranked third," Watmore said.

"But I felt good and ended up in second place."

As well as the 50m freestyle, Watmore competed in the 15-years 100m freestyle, the 100m breaststroke and two relays.

She was extremely competitive in all events and finished third in the 100m freestyle but it will be the 50m freestyle event she will concentrate on at All Schools, which will also be held at the Sydney Olympic Park Aquatic Centre.

She is now setting herself higher goals.

"I'd like to try and get to nationals if I can but that will depend on how I perform at the All-Schools," Watmore said.

"I'm really looking forward to it."

Watmore has attracted plenty of attention for her performances this year. During the Dubbo College South Campus swimming carnival earlier this year, Olivia broke a long-standing 100 metre freestyle record.

The record had been held by former Dubbo South High School student Wendy Diggs for 43 years before Watmore produced a one minute 07:11 second effort to write her own name in the books.

The 14-year-old said her favourite stroke is breaststroke and she trains with her brother Thomas under the guidance of their mother Lisa, who also takes them to compete at carnivals.

"I usually swim about four or five kilometres a day and do quite a bit of strength training at home," she said.

"I've been swimming since I was about nine-years-old and it is hard work but I really love it - swimming is definitely my number one sport."

As part of her winnings at the State CHS carnival, Watmore took home a $500 Eyeline prize pack.