Good work Sam.
Thanks.
(Putting my speculation cap on.) I think it's more likely that this is what happened:
Miller heard that the NYT was going to run with Wilson's editorial--or she just read it.
Miller being a long time Middle East expert knew who blowhard Wilson is--and who his wife is. (It's a thousand times more likely she would know this than Rove would.)
Miller called Rove. She asked for his take on Wilson's editorial, and mentioned in passing a) Plame works for CIA and maybe even b) she suggested Wilson for the trip.
Franklin knows (from WH logs and Rove's testimony) that Miller and Rove talked and she wants to hear her side of it.
IRC, it's been stated that Rove is not the subject of the investigation. So Franklin might want to know where Miller got her information.
This to my mind is the most likely scenario. And it's the one that best explains why Miller would be willing to go to jail than tell.
Ask yourself why Miller is constantly said to be protecting her "sources" when she never wrote an article about Plame. The only explanation is that she told somebody else Plame was in the CIA.
And since Franklin is asking about her conversation with a government official (who were are led to believe was in the WH), it's probably that Miller told Rove who then let it slip to Novak.