she sounds like a sociopath.....I am reading The Sociopath Nextdoor....it claims one in four is a sociopath....sounds like this mom....fist she has no regard for the safety and health of her children leaving them in a hot car unattended...second she assaulted the woman who pointed that out.....at no point does she feel any guilt or remorse...classic symptoms.
25% sounds way too high, though I believe as a society we are making more all of the time.