She believed they were in the clear
The authorities ultimately found out what happened with Rachel’s confession. Their next objective was to find out what Shelia thought about it. The cops devised a strategy. Rachel was wiretapped and told to talk to Shelia about the crime. Unfortunately, this did not work out since the young girl backed down. Shelia obviously had a lot of power over her. Remember, she had already admitted to planned first-degree murder by that point. Despite this, she was more afraid of what Rachel would say to her. It’s difficult to picture a 16-year-old girl instilling such terror in anyone.

She believed they were in the clear.