IMO these arguments are not logical, they are based on the causal fallacy.
To prove that Wendi must have been in on the conspiracy, we shall interpret every action we know she took as being motivated by her being in on the conspiracy, and therefore, without a doubt, she must have been in on the conspiracy.
Eg: Wendi went to lunch with her friends because she was trying to avoid police. Therefore that proves beyond a reasonable doubt she was part of the conspiracy.
"This fallacy occurs when a causal connection is assumed without proof. All too often claims to a causal connection are based on a mere correlation. The occurrence of one event after the other or the occurrence of events simultaneously is not proof of a causal connection."
www.txst.edu
ETA I want to cite an exact similar argument that has been made in the past:
"This black man walking through my neighbourhood doesn't live here, the only possible reason he could be walking along my street is because he is going to commit a crime, therefore I am justified in shooting him because I know beyond a reasonable doubt he is planning to harm me"