Just to add a bit more detail to what you were saying Steve. The video below stitches together several clips that have Rosemary running alongside the Presidential limo. At first she is following an older female (possibly her mother/older sister?). Quickly Rosemary overtakes the older female and if you look in the third clip (a close-up from the Z-film) it appears to me that the older female is cupping her hands to her mouth, possibly calling out to Rosemary who is just running off like a headless chicken.
The girl with her hands raised in the Zapruder film is Rosemary's older sister Linda. She appears to be shading her eyes from the sun. The woman Rosemary ran pass earlier (in the Dorman film) is someone other than Linda Willis.
The mid-Z140s supposedly shows Rosemary's head turn towards her right, but Z147 and Z148, I believe, shows she had not turned her head. If she had turned her head rightward in the mid-Z140s, it would have been for just 1/3 second. Therefore, I believe her face is hard to distinguish in the mide-Z140s due to glare.