lizzie stated to both bridget and mrs. churchill that she'd thought she heard abby return. yooper made an excellent point:
so when would she have had the opportunity to hear abby come in between the time she told her father abby had gone out, and discovering his body? it's a very small window of time. by Yooper » Sat Jun 17, 2006 7:50 am
That's my point, Lizzie had to have known that Abby was dead. Lizzie told those present when the question as to Abby's whereabouts came up that she thought she heard Abby return. If she had gone to the barn, she could not have done that. If Abby returned during the activity after discovering Andrew, it is unreasonable to assume she would not be aware of the crime. If Abby returned before Andrew, why tell Andrew that Abby was still out on an errand?
she said she was in the dining room for a short time, then the kitchen reading while waiting for her flats to get hot enough. very unlikely abby would use the front door, and lizzie would have seen her if she entered the side door if lizzie was in the kitchen. then lizzie says she got her hat and went out to the barn, first stopping at the pear tree. then she's standing for a long time at the upstairs barn window, eating pears. if abby had returned then, lizzie would have seen - not heard - abby come home.
at the inquest lizzie denied saying she heard abby return, so someone's lying, and i don't think it was bridget or mrs. churchill.