I doubt a 15 year veteran of the border patrol would shoot anyone without being in fear for their life. A new scared novice maybe, a seasoned veteran not likely imo. The incident was in daylight hours and not in an extremely remote area, time will tell more details.
She came here illegally and rushed an armed officer en mass. She was killed for her act. Period
I will wait for the details. If he was in danger, then he can certainly defend himself. If he wasn’t, he shouldn’t have shot her.