In February, she was ridiculed after complaining online that it was because of her boobs.
Now newly-obtained emails from promoters to the authorities have proved her right.
“I am damn proud of my REAL boobs and I refuse to sit quietly”
The emails were sent to the South Australia Tourism Commission after the fight in Adelaide.
In one, fight promoter Justin Manolikos wrote: “Sev was not chosen, as she did not fit the dress.
“As I understand, as I was not there… the white (dress) did fit but the grey not, hence she was not chosen.”
After Sev missed out on the job, another model who was chosen for the role, Leah Matuszek, accused her of “sour grapes”.
Ana Cecilia Cunha
And Ms Philippou told the newspaper: “I have nothing more to add to this matter. I stand by my original statements”.
Between rounds, ring girls are tasked with showing a sign to the crowd giving the number of the upcoming round.
They’ve been part of the sport for decades, but some critics say their use is sexist and should be stopped.
Detailing her dismissal on Facebook, Ms Philippou said she was told ring girls couldn’t be too “sexy”.
The model wrote: “The South Australia government has taken over and don’t want girls who are too sexy.
“I am damn proud of my REAL boobs and I refuse to sit quietly and be told I do not fit into a ridiculous standard.”
February’s fight at the Adelaide Oval ended with Mundine losing on points to Green after 10 rounds in a controversial decision.