Hosted by the Society of Women Writers WA on September 17, entries included raw stories or poems that they can use for future writing projects.
Ms St Clair has won a place in the past four marathons, winning the trophy in September last year, and placing second and third in two previous years.
She describes herself as a budding crime novelist who enjoyed life to the fullest.
Other news: words and art collide for Cooloongup writer
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READ NOWIn October, she will travel to New Orleans, where she will spend two years researching and writing her stories.
“I love to travel and experience new things,” she said.
She has previously experienced parachuting, whitewater rafting, mechanical bull riding, parasailing and hitchhiking around Australia, and taken a ride on a Harley, owned a convertible and partied on Bourbon Street, New Orleans.