I also get female vibes from the footage.
In regards to the weapon / expertise and going out on a limb, the totality could indicate:
Daddy's tom girl who grew up in a rural area or, what was then a rural area before Houston swallowed it. Daddy's tom girl was introduced to recreational "plinking" at a young age (but has never received formal training as she does not take a trained shooters stance).
She shoots the victim with a .22 caliber revolver, which helps account for the apparent lack of recoil and ability to keep the weapon centered. Going further out on the limb, .22 revolvers are not very common. I am thinking it could be "Daddy's old target pistol" that was retrieved from a closet somewhere.