as an update to that case, police detailed the extent of the boys mutilation
https://kstp.com/kstp-news/top-news/complaint-boy-found-in-car-trunk-was-shot-up-to-9-times-mother-charged-with-murder/"Julissa Angelica Genrich Thaler has been charged with 2nd degree murder with intent. Charges say she shot the boy up to 9 times, possibly with a shotgun, including shots to the torso and head.
Police found a shotgun shell and casings in the vehicle."
"The complaint states that officers immediately went to Thaler’s apartment after finding Hart, but she’d already left and was washing the clothes she’d been wearing. She was arrested nearby and had apparent blood and brain matter in her hair, authorities noted."
The witnesses who confronted her just described a grisly scene and blood and gore dripping from her trunk. I'm guessing the "up to 9 times" is based on 9 spent shell casings, else she clearly pulverized him beyond the point they could tell