The City winger, who completed an hour of the triumph in Canberra, doubled their lead two minutes after Sam Kerr had opened the scoring to help her country to their second win of the two-game series.
Alanna Kennedy also featured, playing 74 minutes and was substituted after a collision in which she suffered a nose injury.
Australia had needed a late comeback to defeat the Football Ferns on Friday but they stormed into a 2-0 lead inside 17 minutes this time out.
Kerr opened the scoring, heading home Steph Catley's corner before Raso made it two, collecting a loose pass and driving towards the edge of the box before curling low into the bottom corner.
It was three on 32 minutes when Kerr was sent clear by Emily van Egmond and poked beyond Nayler.
Hannah Wilkinson pulled a goal back in injury time at the end of the first half but the Matildas held on for a comfortable win.
Meanwhile, Khiara Keating and Ruby Mace helped England's Under-19s to clinch their place at this summer's European Championships.
A hat-trick from Agnes Beever-Jones clinched a 3-0 win over Belgium in the final group game of their April fixtures, as Gemma Davies' side maintained a 100% record.