The 23-year-old will represent Australia at the 18th edition of the championships in Birmingham, England, on October 11.

Her selection for the championships follows outstanding results at the Gold Coast half marathon last month, where Fien covered the 21.1km course in 1:12.24 to finish second.

Fien enters the world championships on the back of a stellar 12 months, taking out the national half marathon title in Melbourne in October in a time of 1:15.13 before placing second to Lara Tamsett in December's Zatopek Classic, covering the 25-lap course in 34:34.16.

She went on to smash Kerryn McCann's course record along the Great Ocean Road by five minutes in May, clocking 1:13.02 for the half marathon (1:19.38 over 25km).

Fien then posted the tenth-fastest time ever recorded by an Australian female over the half marathon distance on the Gold Coast in July (1:12.24).

''I'm so excited and to hear that I was the only female selected, I couldn't believe it,'' Fien said.

The self-coached athlete said her selection to the team marked the realisation of a long-held dream to represent Australia.

''I feel like I'm in great shape, I'm coaching myself, so it was one of those things where I didn't quite know where I was sitting, but I just kept training hard and to get the results I have, I'm flabbergasted,'' she said.

''I was selected for the world junior cross country championships when I was 16 or 17 but unfortunately I didn't have the funds to get over to the meet but my mum always said that if I was going to represent Australia and it was my passion I'd achieve it later in life and I have.''

Fien will head west later this month for her final hit-out in the lead-up to Birmingham, lining up in the Perth City to Surf half marathon event.

''I want to get out of this as much experience as I can, I don't know quite where I sit on an international level.