still think you should try to get one other chick for company, as s/he will be very lonely and sad all alone (loud peeps = scared + lonely). it is the way of the chicken. if the sign said 'pullet', it is 90-95% likely to be female. i really think you should try to get another, the space/time/poop issues are the same for one or two. or maybe try to find a new home with someone who has chicks the same age.
until then, hold baby chicky as much as possible if it seems to calm him/her down, it seems to for mine.
good luck!!!