That idiot mom, I sure hope someone reported the coyote chase to authorities. Coyotes chasing humans, even small ones, and especially where big humans are around, seems to me to be rather unusual. Could be the coyote was just curious, could be something was wrong, very wrong.
As a rule, wild animals that don't act wary of humans, especially ones that are much smaller than a full grown human, would have me suspicious about maybe having rabies or some such. In any case, she should've made it a point to tell someone in authority, rather than leave to some other poor sod to deal with. Irresponsible and self-centered actions.
Yes, we have coyotes in our neighborhood, big ones. They might come after my puppy or the neighbor's cat, but not if I or anyone else in the hood is nearby. They watch us close, and if we even act like we are going for a gun they bolt. Maybe this one knew better, but coyotes going after humans in a place where other humans are just don't seem right regardless of the setting.
_________________________
The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)