The carnival began on Monday and will finish on Thursday. WA thrashed the combined South Australian/Northern Territory by 92 points, posting a score of 13.21.99 to 6.1.7.
The commentators said the WA side played as well as the men and they will continue the competition as favourites.
Players selected include Demi Okely, Emma Swanson, Tayla Bresland, Kira Phillips, Courtney Ugle, Rachel Shepherd and Sabrina Traub from the Thunderbirds League team.
This will be the fourth under 18s national carnival played by WA.
The WA side has reached the grand final twice, only to be beaten by Victoria on both occasions and finishing third last year.
Thunderbirds player Emma Swanson will lead the State as captain, while Sabrina Traub, Tayla Bresland and Kira Phillips are vice captains.
For more, go to aflcommunityclub.com.au.