I was hoping that the ladies of a specific group in the Z-film would turn their head at one point. And they did. The results are not great, though. One of the ladies has lots of hair like Mrs. Westbrook had. I'll try later to find a better image.

Nice catch, Denis.
In the lower image (which is either Z-133, Z-134, Z-135, or ...) we can see that the gal dressed all-in-white has already turned her head to her right, which is very interesting since she's probably reacting to Oswald's first, missing-everything, shot which occurred at hypothetical "Z-124"-- half-a-second before Zapruder resumed filming at Z-133.

I mean I mean I mean (to use DiEugenio's favorite expression)
Why else would she stop looking at JFK and Jackie at that point -- the limo's right in front of her, for crying out loud!
Regardless, I believe the dressed-all-in-white gal we're talking about is either Karan Hicks or Carol Reed (the gal wearing the red headscarf is the "Running Girl" on Elm Street Extension in Couch-Darnell), and that to her immediate left is the-one-and-only tallish
Karen Westbrook, wearing a dark-colored dress or raincoat and a "white" headscarf (or perhaps a light blue one that was similar in color to the one Sharon Simmons was wearing "by" the Stemmons Freeway sign), and who happened to turn her head to her right (upper image) in Z-22, about six seconds earlier, i.e., before the limo had turned onto Elm Street.