In a surprise move, she was selected in the double scull alongside Brooke Donoghue, displacing the reigning twice world champion Olivia Loe.

The following year, she raced the quad scull in the 2013 World Rowing U23 Championships in Ottensheim, Austria, where her team (including Olivia Loe) came fifth.

[1][4] In October 2014, Osborne was part of the women's UVA eight that won the Head of the Charles Regatta in Boston, Massachusetts, United States.

[2] Osborne returned to New Zealand in 2015 and competed in the quad scull in the 2016 World Rowing U23 Championships in Rotterdam, Netherlands, where the team came first in the B-final.

[12] When the crew selections for Tokyo were made in June 2021, it came as a surprise that Osborne had displaced Olivia Loe, joining Donoghue in the double scull.

[5][13] Stuff's rowing commentator Ian Anderson considered the women's double scull "to be among NZ's leading medal contenders in Tokyo".

[14] Osborne and Donoghue won their heat, placed second in the semi-final and took the silver medal in the Olympic final behind Romania.