Ammo is cheaper than the cost of medical attention. Bullets are not magic. Unless you disrupted major, central nervous function the target will continue to be a threat for an unpredictable amount of time after you pull the trigger.
She probably wishes she had emptied her firearm into the hog while he was stationary, a full ten seconds after the first shot. Instead, she holstered the handgun.
Images of the man near the end of the one-minute video.