Lizzie's Lies

[Yooper]

I would like to know what led the police to believe that Bridget was not involved. Lizzie told the police that Bridget had gone upstairs, but Lizzie had supposedly gone to the barn, so how would she know that Bridget remained in her room?

I think the crime was so horrific, that at first neither woman in the house was suspected. The thought only slowly dawned on the police when things Lizzie said and did didn't add up...by then no one was thinking Bridget.

That's true, and Bridget lacked motive from the start.