I am not going to play the "probably" game with you. I am going to double down on my original statement. If you are armed, have proper training (pre-requisite for carrying IMO) and have the proper attitude your chances of surviving an encounter with a predator (even if he is behind you with a gun to your head) go up dramatically . If you want to argue that fact, go ahead. Not being armed and not fighting back when/if you have a chance will lead to your death whenever the predator decides to kill you, 100% of the time.
I can understand why; the moment the guy sat down behind her and drew a gun, the odds were against her, no matter what caliber weapon she may have had, or how many rounds it held. (She would have had a better chance following the other poster's suggestion and crashing her car.)
The reason that so many perps immediately put their hands up when the cop points a weapon at them is that they are very much aware that because the cop has his gun drawn and pointed, they simply don't have the time to draw their own and get off a shot.
Uber drivers, and pretty much everyone else, understand this as well.
As your screen name isn't "Yosemite Sam", I'm curious as to how you would draw the sidearm of your choice and get a shot off at someone behind you before he killed you; your input here could enlighten the rest of us.