[2] In 2009 Millward won two medals at the British Disability Swimming Championships, taking a silver in the 100 freestyle and bronze in the 100-metre butterfly.

[8][9][10] At the 2011 IPC European Championships in Berlin, Germany, Millward won three gold and two silver medals, including setting a world record time of four minutes, 52.40 seconds on the way to winning gold in the 4×100 m medley relay (34pts) alongside Heather Frederiksen, Claire Cashmore and Louise Watkin.

[2][11] Millward was named as part of a 44-swimmer squad to compete for Great Britain at the 2012 Summer Paralympics in London, United Kingdom.

She won bronze in the 4 × 100  m freestyle relay (34pts), swimming with Cashmore, Watkin and Susie Rodgers; a silver in 400 m freestyle S9, finishing behind South African Natalie Du Toit; another silver came as she once again finished behind du Toit in the SM9 200 m individual medley in a new European record time of four minutes, 4.40 seconds.

[19] Millward was appointed Member of the Order of the British Empire (MBE) in the 2017 New Year Honours for services to swimming.