SF, is there a way to ask Squirrel Master to keep an eye on that other one, that looks like molting/early mange thing?... Just in case it is early mange indeed, so that s/he can be helped timely?
This little one does look awful, can only imagine what she's been feeling like! With all that itch (1/4" crust!
) she, probably, couldn't even get enough sleep and that must have been weakening her, too.
Interesting about the chasing away, because I have seen two squirrels here, who seemed wobbly (and hence, weaker), but they were chasing away others all the time.