She contested in 5 Commonwealth games between 1986 and 2002, winning two bronze medals in both individual (in 1998) and team event (in 2002).

She played for her country in eight Uber Cups, eight European Team Championships and six World Championships and has the most international caps (136) and national titles (22) of any Scottish female badminton player.

She was an advanced coach at equivalent of UKCC level 2 and has coached at World University Games and World University Championship level.

[3] At present she is appointed as Team Scotland Chief-de-Mission 2022 Commonwealth Games, having previously served as a deputy chief in 2014 and 2018 commonwealth games.

[4][5] Middlemiss was appointed Member of the Order of the British Empire (MBE) in the 2024 New Year Honours for services to sport.