Knowing a crime is going to be committed without doing anything to contribute to it is not enough. They'll need more than than her just driving by the crime scene. Wendi providing details about Dan's schedule would probably be sufficient to implicate her, though.
As I wrote-—”One of the major mistakes by Wendi”
One mistake will not convict Wendi. Just like Donna, when Wendi is indicted and tried in court we will learn about her many other mistakes that will tank her just like the many mistakes tanked Donna.