my only suggestion based on watching that video of Katie dry firing would be for her to keep the pistol up longer, aiming at her target after pressing the trigger smoothly, and not be so quick to reset and reholster
from what I could tell, she pressed the trigger and then immediately lowered her pistol to rack the slide with her support hand and then holster; you don't want that action to ingrain itself and translate to the range during actual live fire, where she should be watching the front sight rise and then settle back down into its natural POA