The actress, 40, is best known for playing Sarah Barlow, previously Platt, on the ITV soap opera Coronation Street.
The vicious fight occurred outside Tina’s home in the Stockport area last Friday evening.
Shocking footage caught the 5ft 1in star throwing punches and putting one girl in a headlock as she tried to break a fight up.
The soap legend was also hit and had her hair pulled after she rushed out of her £1million Manchester home wearing pink jogging bottoms.
But Tina was praised by the mum of a youngster who she rushed to protect.
She told The Sun: “Tina has been pretty brave in stepping in. Tina is only little herself and she was defending my daughter, so I am extremely grateful to her.
“You can hear in her voice on the video that she is frightened. This is also not like her, and she is a really good person.
“I have thanked her and would have done the same if it was my house.”
A pal of Tina’s said she is now looking at beefing up security at the home, which she shares with hubby Adam Crofts and her two kids.
The pal said: “Naturally, her number one priority is making sure they are safe and, crucially, that they feel safe.”
Tina also held a crisis meeting with her soap bosses, who offered their “total support”.
She has been given a week off work after she was left “traumatised” by the brawl.
One source said: “Tina went straight to meet her Corrie bosses this morning.
“She told them she was the victim here, and they have accepted that.
“They also think the incident has traumatised her so have been very sympathetic.
“Tina has been left really shaken and they told her to take a week off.”
A spokesperson for O’Brien said: “Tina was the victim of an unprovoked incident outside her home which she has reported to the police.”
Greater Manchester Police said: “Officers are investigating reports of an assault in the Stockport area between 8pm and 9pm on March 15 2024.”
They confirmed that no arrests have been made over the incident but that inquiries are ongoing.
ATTACKS ON EX’S MOTOR
By MICHAEL HAMILTON
The Sun revealed that the motor’s wing mirror was taken off and its paintwork scratched during the 1am bust-up.
The couple started dating in 2003 when they were both starring on Corrie and have a daughter Scarlett.
But they then had a “fractious relationship” after splitting in 2009.
Tempers were said to have flared after Tina had been partying with friends, and Ryan went to meet her.
A source said at the time: “It was quite a disturbing incident and Ryan drove away as soon as he could. He’s furious.”
Ryan, 39, played Jason Grimshaw in Corrie until 2016. He has since retired from acting.