As someone said their MIL keeps families license plate details, a little odd, but not "so odd." Until that person is a murder suspect then every odd, unusual, strange thing is going to need to be explained. I drive a long way to work, I could take a shortcut, not sure why. It's not a problem though because I'm not a murder suspect.
So WA drove 2,3, 5 minutes out of her way, not a big deal until you consider she's a murder suspect. Arguably unfair as humans are odd character that do random, abnormal things that should not necessarily mean they are guilty. And how does WA defend that - "I'm bad with directions."