The case says less about miller:
Supbpenas "seeking documents and testimony related to conversatins between her and a specified government official "occuring from on or about July 6, 2003 to on or about July 13, 2003,...concerning Valerie Plame Wilson...or concerning Iraqi efforts to obtain uranium."
Presumably that person isn't Libby since long before he released the reporters. Who could it be...and just how did she get involved in this matter...she apparently wrote nothing about Plame
If she never wrote about Plame, then wouldn't it have to be "concerning Iraqi efforts to obtain uranium"? She was the Times' "beat writer" on WMD, after all.
In order to have a "source", one must first have a story published, I would think. Indeed, to warrant the GJ subpoena, one would've had to have published a story in which one cited a source. I doubt they can subpoena idle gossip.
Would be nice to know what she published in that time frame. But given Miller's beat and his proximity to Plame, may I suggest Alan Foley?