What do you know about making conclusions. I've never seen you make on that made sense.
How about: since 25 witnesses said that JFK reacted visibly to the first shot and zero witnesses said he kept smiling and waving after the first shot, and since the zfilm, the shot pattern evidence, and the evidence as to JFK’s location at the time of the first shot, are all consistent with JFK being hit by the first shot, then the first shot must not have missed.
It only suggests that to people who are bad at figuring. That was about 3 seconds after the first shot was fired. She reacted about the same time JBC did at Z164 when she began shortening her strides in order to come to a stop.
But she did not slow down until z188. From z142 to z166 she takes 4 full strides (from left foot planted right stride, left stride, right stride, and left stride with left foot planted at z166). That is 6 frames per stride. From z166 to z180 she takes two more strides (7 frames per stride). From z180 to z188 another stride. From z188 to z199 one more stride before stopping at z199. Not much if any attempt to stop until after z188.
She did not say she slowed her running when she heard the first shot. She said she stopped-at least that is what Pozner said based on a June 3, 1979 article in the Dallas Times Herald (Case Closed, ch14, fn 18).