Sentence:  <WSD>Back</WSD> at the Factory-to-You with the other old maids , back there she was the youngest clerk and she was thirty-four , which made her young enough to resent the usual ideal working conditions , like the unventilated toilet with the door you had to hold shut while you sat down . 
Meaning of the word marked with <WSD> tags:  in or to or toward a former location