She attended Regina Coeli Beverly Hills before going to high school at MLC Sydney, Burwood.
She is from Padstow, New South Wales. Her grandmother is a swimming coach. As of 2012, she lives in Sydney.
Ashwood is a swimmer, specialising in the 800-metre freestyle event.
As a four-year-old, she started swimming. In 2012, she was training with Jayden Hadler, Daniel Arnamnart, James Magnussen and Daniel Tranter.
She was coached by Jon Shaw from 2009 to 2010. Brant Best became her coach in 2010 and was her coach from 2012 to 2014, and by Vince Raleigh since joining the Chandler Club in Queensland.
At a 2009 transtasman swimming meet, Ashwood beat Kiwi Phoebe Williams to finish first in the 800-metre freestyle event.
At the 2009 Australian Youth Olympic Festival, she lost to Kelly Marquenie in the women"s 800-metre freestyle event. She finished second in the women"s 400-metre freestyle event. At the 2011 National Championships, with a time of 16:14.47, she finished second in the 1500-metre freestyle which secured her a spot on the national team going to the World Championships.
At the 2011 World Championships, in her national team debut, she did not make it out of the semifinals in the 1,500-metre.
At the 2011 Junior Pan Pacific Championships, she finished third in the 400-metre freestyle with a time of 4:12.47. At the 2012 Australian National Championships, she finished second in the women"s 800-metre freestyle with a time of 8:27.97.
As an 18-year-old, she was selected to represent Australia at the 2012 Summer Olympics in the 800-metre freestyle event in what were her first Games.