The Eagles have maintained a steady focus despite their impressive form, turning their attention to Saturday's Pride Round clash with Port Adelaide after securing the club's first AFLW Western Derby victory.

West Coast stunned Fremantle on Sunday to claim a historic breakthrough win, extending their winning streak to four matches and keeping their finals hopes alive.

Coach Daisy Pearce said the Eagles were enjoying being in the hunt for a finals berth but remained focused on the process rather than the ladder.

"It's great to be in the fight this far into the season and we feel like it's a real possibility, but we don't look too far ahead," Pearce said.

"We're just focused on beating Port Adelaide now.

"We keep it pretty short-sighted on just loving playing your role, loving doing your bit for the team and having that feeling at the end of a game where you know everyone's contributed.

"I think if we chase that well and get that week to week, finals will look after itself."

While the Eagles celebrated a significant milestone on Sunday, ruck Charlotte Riggs said the result carried special meaning for players who had spent years chasing a Derby breakthrough.

"It was pretty special," Riggs said.

"You see girls like Kellie Gibson, Emma Swanson and Belinda Smith going through years of wanting to win so badly.

"I think it was as important for them as it was to me."

Riggs played a key role in the victory, producing one of the highlights of the match with a spectacular contested mark and competing strongly against Fremantle star ruck Mim Strom.

The second-year Eagle said she had gained confidence from testing herself against one of the AFLW's premier rucks.

"Mim is such a good player, and she's been such a good ruck over so many years," Riggs said.

"I just wanted to compete, and I think we both competed really hard.

"It was a really good battle, and I definitely learned through some of what she was doing so I can hopefully apply more of that to my game as well."

Pearce said Riggs' growth had been one of the success stories of the season, highlighting her aerial ability, football intelligence and follow-up work at ground level.

"She's a quick learner, high footy IQ, so she's adaptable and can take her strengths to different parts of the ground," Pearce said.

"I think that was the thing that set the game apart in the fourth quarter, some of Riggsy's hunt on the ball and driving her legs out of contests.

"To have a ruck that can do that and be effective in play is a bit of a luxury."

Saturday's trip to Alberton Oval will be a special occasion for Riggs, who will return to her home state to take on the Power in front of family and friends.

"So excited," Riggs said.

"It's always fun to go back and it just brings two worlds together, football and my family, which is really cool."