you are the first one I have ever heard to propose that theory. And you know what? I think I agree with you. Your explanation makes sense. I can see no "bone fragment" she is supposedly chasing and she doesn't appear to be helping the Secret Serviceman.
I think you're onto something!
I'm not one of those people who is fascinated by the JFK assassination (and all the associated conspiracy theories), so I hadn't watched the Zapruder film in any detail until tonight. When I found that vidcap I watched it several times to get an idea of what happened. It's horrific footage, especially on the first viewing. After several times you can concentrate more on the details. It sure looks to me like Jackie, having just watched JFK getting shot for a second time, tried to get out of the car.
I want to say that I'm not trying to debunk any myths or say anything bad about Jackie. The footage is shocking enough sitting here 40 years later. Can you imagine how confusing and bewildering it must have been sitting just a few inches away?
One other thing, I don't know how anyone can say that JFK and Connally were not hit by the same bullet. Both of them react automatically at the same instant. JFK's elbows and Connally's left arm flap up simultaneously. These weren't conscious actions. I can't see anything in the footage that suggests multiple shooters. However, I can only see two shots when supposedly three were fired. Do you know when the third shot was supposedly fired? Was it before or after the two clear shots (or in between)?
Didn't John Connally say out loud, "They're going to kill us all"? I assume Jackie would have heard that.