I can only speak from personal experience , if you have a jill who has been an only jill for a few yrs ,its possible she may object to a new ferret, i had dozons of jills returned to me due to the constant fighting after they had been re homed,they seem less tollerent than hobs to change
But its not to say you cant find a friend for your ferret,it may work ,it may not, in an ideal world they would all live happily together but sadly sometimes its impossible, all you can do is try, ferrets who have lived happily together can also become balls off fury for no real apparent reason, if you ma