The youngster, who joined the club at the age of eight, has followed in the footsteps of fellow academy graduate Georgia Brougham in committing her immediate future to Nick Cushing's side and was delighted to put pen to paper on a two-year deal.
Alongside Brougham, Wythenshawe-born Brooks has witnessed first-hand the team's transformation, declaring she still has to pinch herself to believe how far she's come.
"I was so happy when I signed," she smiled. "Chris Williams (my goalkeeping coach) was the first person to tell me and it was a good feeling to have paid back to him the hard work he's put in to help me over the past year.
"I'm so proud the club feel I'm good enough. I've been here a long time since I signed from a local boys side and I've gone through all of the junior stages to the first-team so it feels great.
"When I first started, I never thought I'd be where I am now.
"My life is literally just football because I also work for City in the Community as a coach, so I train with the team in the morning and after lunch, I work in a school. I love it!"
The 20-year-old made her senior debut on the final day of the 2014 league season, taking her place between the sticks for the visit of Chelsea.
Player of the Match for many, the shot-stopper made some terrific saves to keep the title-chasing visitors at bay and helped her side to a famous 2-1 win. Needless to say, it was a day she remembers fondly.
"That was so surreal," she recalled. "When you're thrown in at the deep end, it's nerve-racking and I only realised afterwards what I'd just done. Throughout the game, you're not thinking about what's around you - you're just in the game.
"To come out the way we did was amazing and I proved to myself I could compete at the top level."
Currently training as an understudy to Karen Bardsley, Brooks acknowledges her own improvement over the last 12 months and hopes to progress further to become the very best in the future.
"Playing with the likes of KB, you're learning all the time as well as trying to beat them," she stated. "KB is England's number one so training with her will only make me a better player.
"I'm still learning at the moment and I know my time will come when I'm ready."
Manager Cushing was pleased with his latest capture, telling mcfc.co.uk: "Alex is a young goalkeeper who has improved hugely, working alongside KB with our goalkeeper coach Chris Williams.
"We are proud that she is another of our own who has been developed at our club from a young age.
"She has been rewarded for her attitude and efforts and has done herself proud, having also forced her way into international call-ups at youth level.
"With hard work and continued focus, we hope she and Georgia can achieve more in the future."
MCWFC's first game in their new home takes place on Saturday 21 February at 2pm - before City's first-team host Newcastle at the Etihad Stadium in the Premier League at 5:30pm.
Tickets for the game at the Academy Stadium are FREE for seasoncard holders and Cityzens, and are priced at £3 for adults and £1 for concessions (under-16s and over-65s). Seasoncard holders must redeem their ticket beforehand.
For full fixture details, click here.
Seasoncards for Manchester City Women's second campaign in the FA Women's Super League are now on general sale.
Secure your seat at the new Academy Stadium to cheer Nick Cushing's side on in three competitions as the 2014 Continental Cup champions fight for another piece of silverware.