It does not seem to be as this report would have it. Post #155 has a September 30 article about Owen withdrawing her name---before Miers was nominated on October 3.
Owen empathically denies that she withdrew her name.
Well, since we are taking various people's words for what other people said, it's hard to be sure. And I doubt whether Priscilla Owen will publicly say that she did not withdraw her name, because that would be political suicide.
I saw the post you refer to, and it occurs to me that the unimpeachable source it refers to might well be none other than Karl Rove, who apparently was telling Gary Bauer about that time that the other candidates had withdrawn. In other words, it might be more disinformation from Rove.
This gets too cloudy to be sure about, so I think I'll put it aside as something to keep in mind, but "neither proven nor disproven" until we hear more.