It signals a massive change to the basic world building of the series. It just isn't plausible with the world that RJ set up. Maybe the white cloaks got her to drink some fork root tea (implausible), she went into a steading for some reason and got captured there (implausible), or the white cloaks are in league with other channelers that have shielded her (implausible).
In the books, the white cloaks know their only chance for killing an Aes Sedai is in an ambush in which the Aes Sedai is killed or mortally wounded before she knows what has happened. I'm worried about what basic rules Rafe Judkins feels free to break in his adaptation.