The school's CCTV camera captured the moment the gunman approached the group of people on Saturday morning, raising his gun and trying to steal a bag.
An armed mom pulled a gun from her handbag and fatally shot a man who had pulled a gun on a group of mothers with young children who had come together for a Mother's Day celebration - and the entire incident was caught on video.
On Sunday, Sastre was commended in a ceremony by Sao Paulo governor Márcio França, who applauded her "dexterity, technique and courage" in dealing with the potentially very unsafe situation.
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He further questioned why Mumbai trial wasn't completed while adding that he always spoke the truth and stood by it. Following the prime minister's comments, the opposition parties staged a walkout in protest.
While he was down, she kicked his weapon away and made an emergency call from her mobile phone, but the 21-year-old gunman died from his injures soon after arriving at hospital.
Sastre is seen shooting the gunman three times in the chest.
Sao Paulo Governor Marcio Franca visited Sastre at her police station and praised the officer for her heroic actions.
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The driver of the auto she had taken cover behind drove off as she completed her courageous actions by kicking the robber's gun to one side, coming close to knocking her over as she stopped down to recover the revolver.
"Thankfully she was faster than him, because when a thug discovers [their opponent] is a police officer, he shoots to kill". "Her courage and precision saved mothers and children, yesterday at the door of a school", he wrote.
Husband of officer Sastre, military police lieutenant André Alves said to Folha de Sao Paulo: "The suspect's gun fired once, but it is not known whether or not it was before Katia fired".
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"I didn't know if he was going to shoot the kids or the mothers or the security guard at the school door".