Nadaud made birdies on the first and third holes before an eagle on the fourth, and she made a further birdie on the fifth to go to the top of the leaderboard.
The 25-year-old, born in Epsom in the Surrey county of England, joined Chelsea in 2018 after playing for grassroots teams Bookham Colts, Leatherhead Predators, and Epsom Eagles.
Healy, who took over the role from Lanning following the two-time ICC Women’s Cricket World Cup winner’s retirement from international cricket at the end of 2023, is now 35 and gradually nearing the twilight of her career.