West Coast's AFLW side has notched a historic first Western Derby victory, grinding out a 12-point win over Fremantle at Sullivan Logistics Stadium on Sunday to continue their surge up the ladder.

The Eagles' breakthrough derby triumph was their fourth consecutive win, lifting the club to a 4-4 record and keeping their finals hopes alive.

Coach Daisy Pearce said while the significance of securing the club's first AFLW derby win was not lost on the group, the result also provided further evidence of the team's development.

"I think first and foremost, it’s good to keep the winning going," Pearce said.

"The bigger picture being a Derby and our first one means a lot. It gives the girls a bit more belief and signs of their growth.

"To be able to grind out a win on a big stage like this, where lots of fans have turned out and we know the history between the two teams, will give them another little bit of evidence of how far they've come."

Despite Fremantle applying plenty of pressure throughout the contest, Pearce was pleased with her side's ability to stay composed and stick to its process.

The Eagles generated repeated scoring opportunities and eventually broke the game open late, with Pearce highlighting the contributions of players rotating through the midfield.

"I thought across the whole game we were up for the fight," Pearce said.

"The girls are getting better at sticking to the process, not panicking when we are in a fight and knowing if we keep turning up, the opportunities will come.

"Being able to have players like Abby Bushby and Courtney Rowley go through our midfield and give us fresh legs is a good sign of our versatility and the depth that's growing across the squad."

Young star Ella Roberts again stood tall, producing another influential performance despite receiving close attention from Fremantle throughout the afternoon.

Roberts was named best afield for the second time in a Derby after gathering 22 disposals, laying six tackles and kicking a crucial goal in the third quarter.

Pearce praised the 21-year-old's ability to handle the pressure that comes with being one of the competition's most dangerous players.

"She's an incredible talent and she's starting to understand the influence she can have on others around her,” Pearce said.

"One of the things that's underrated in her game is her courage.

"The way she flies for marks, attacks the ball at ground level and takes on tacklers.”

The Eagles' ruck combination of Charlotte Riggs and Sarah Lakay also played a vital role against Fremantle star Mim Strom, with Pearce praising the pair for executing their plan to wear down one of the competition's premier rucks.

"The partnership of Charlotte Riggs and Sarah Lakay has built really nicely across the season," Pearce said.

"Riggs is developing every week as a ruck, not just with her craft but the impact she can have around the ground.”

With a six-day break before facing Port Adelaide, Pearce said the focus would quickly shift to facing the Power on Saturday at Alberton Oval.

"We just keep trying to win the next one," Pearce said.

"We're enjoying the feeling of being on the ropes a bit and having to fight every week.

"It brings out the best in our group, and we've got to stay hungry and keep looking for ways to improve."