While not giving the Uvalde cops an iota of respect, gun vs gun is a little different than gun vs knife. The Aussie cop still gets full creds and props. In the land of gun free zones, the bad guy thought that the one-knifed man would be king, but a bullet proved him wrong.
I totally get her administering CPR. However, not knowing the condition of the assailant at the time, I might have waited for backup so that he couldn't pull a Ser Gregor on me after he was down. He might have already been down and out though.