This is a 7 year old kid, probably emotionally about 2, with limited language skills, spitting, kicking, and hitting for the last 3 months, who is drawing pictures. This is acting out, not being a sociopath.
Sociopaths start out as conduct-disordered. I cannot blame her for returning him.
Behavioral issues like these hardly point to a sociopath.
I can't wait to lay that one on my ex-girlfriend (single mom) about her two little monsters angels.