Very unusual...
Originally thought "she" was trying to protect a youngster but when I took it full screen she's definitely a "he", so my wife thought "breeding season madness" (chase-me chase-me chase-me) when the males go nuts (pun intended) and chase any female on heat (across streets, under truck wheels, buses, etc) and she will mate with the one that catches her (definitely a surviival of the fittest thing), so...
Squirrel's are nortoriously "loners" but love playing when youngsters...
(It's not quite Kenny Five-One yet Ma'am...
)