At Melbourne, Libby reached new heights in her game. In 2020, she solidified her place in the Demons' backline and delivered dominant performances that earned her All-Australian honors, along with nominations for the AFLPA MVP and Most Courageous awards. She also won the prestigious Melbourne FC Trademark Award, cementing her status as one of the competition’s top defenders. In 2021, Libby was elevated to a leadership role, voted into Melbourne's leadership group by her teammates and staff. However, despite their best efforts, the Dees fell short in the preliminary final against Adelaide, missing out on a Grand Final appearance.
Libby returned to her peak form in 2022, earning her second All-Australian selection. She played a central role in Melbourne’s defense alongside Sarah Allen, anchoring the backline at full-back. Despite Melbourne's heartbreak in the Grand Final against Adelaide, Libby’s individual performances were outstanding, ranking second in the league for intercept possessions. That season ended on a high note, as the Demons claimed their first AFLW Premiership in Season 8.
After a challenging Season 9, Libby ventured into new territory, signing a three-year deal with the North Melbourne Tasmanian Kangaroos. Her move was a reflection of the high demand for her skills across the league, marking a fresh chapter in her illustrious career.