Mia played 7 games in the curtailed 2019/20 season, having made the step-up from the clubs developement centre along with 3 others and twice for the 2nd team in the Devon League Division 1, scoring once. 
Mia played for Exeter City 1st team and the 2nd's in the Devon Women's Football League Division 1, in 2020/21.

Mia was one of 5 players from City who took part in the National College’s Regional Trials on the 31st of October 2020. The club wrote, 

Playing Record

Other Information 

In May 2021, the club reported 

“After being informed of their success in reaching Phase Two of the England College’s National Team Trial Process, the wait has been a long one for Sasha Henderson and Mia Preston.

November 12, 2020 was the date the Young City pair learnt of the exciting news, before the National Lockdown forced a lengthy delay. Thankfully, two of Exeter City Women’s brightest talents, will now get their chance this weekend as the trials take place at Loughborough College.

The Phase Two trial will see 50 Female Players train and compete in a bid to make the final squad of 20. The Session will be coached by Keith Boanas, a Women’s FA Cup winner as Manager of Charlton, and will also see Aston Villa defender Natalie Haigh on hand to share her experiences and identify some of the Young talent on show. If successful, Sasha and Mia would be part of an England College’s Squad who will face RAF and Academy teams during the Summer months as part of their further development.

Mia will be looking to put the hard work put in during the Lockdown period to good use when the Trials begin. “I’m looking forward to the opportunity. Sasha and I have worked really hard on our fitness and are just glad that the trials are still on. I’m really excited to show what I’ve learnt on the pitch with Exeter City and hopefully I can impress on Saturday.”

Mia Preston hit her first National League Goal as Exeter moved up to 3rd in the League Table with a 7-0 win at Buckland Athletic on the 22/9/2021

At the end of the 2021/22 season, Abbie Britton wrote the following 

"Mia Preston will not be returning, opportunities have been hard to come by and the young forward looks to be heading to a new venture to gain more playing time."

Torquay United WFC anoounced that Mia had signed for them in July 2022.
"The first of our new signings to be announced and one we our so excited about is Mia Preston who we have signed from Exeter City Ladies.Mia is a fantastic talent and a player that we cannot wait to to see get on that pitch for us in 22-23".