Interesting idea ("cherchez la femme", the French cops always said), but why do you think so? Was there something in the phone-call audio that makes you think that? Or, shall we say, a "strategic gap" (as in, Rose Mary Woods and the Nixonian "18-minute gap")?
Since it has been a while since this happened, maybe my memory is not that sharp, but was the COMPLETE AUDIO of that phone call played in the COURTROOM ?