Sink, of course she's attacking the women. But she's not attacking their marriages. She's using rhetorical devices to force the dumbed down masses to THINK about these women as being similar to a Cindy Sheehan type.
We knew what Casey Sheehan stood for and that Cindy was trampling on all he stood for, using his sacrifice in Iraq to do so. For all we know, Ann points out, these women may be doing that to husbands that would scream at them to shut up and go away if they could. But they can't cause they're dead. So Ann just wants people to ask themselves some pointed questions about whether these women ought to be so sainted and so credible and so unassailable just because their husbands were terror victims and they decided to trash Bush.
But of course, most of all, as pissant acknowledges, she uses her rhetoric to sell her book.
And by attacking their marriages and their dead husbands she is accomplishing the exact opposite of what you say she intends. People who dislike them will still dislike them, those who like them will like them more, and those who were on the fence will now like them because of Coulter's meanness.
You're right about Coulter using her rhetoric to sell her book, which is just about the only thing she cares about in life.