Ms. Palin is an extremely inexperienced shooter.
First, she allows her dad and the guide, who are both apparently nitwits, to jabber at her continually throughout the performance, make suggestions, swap rifles when it turns out that the first one has a bum scope (!), and allow her to blaze away at a moving animal.
An experienced shooter knows that when he (she) picks up a gun, he (she) is responsible for it, and the way it works. If you have doubts about its safety, you don’t use it. Before you shoot at something living, you check to see if it’s sighted in. Period. No excuses.
If nitwits are yammering at you, you tell them to shut the f**ck up because you can’t concentrate. No experienced shooter would put up with their nonsense.
An experienced shooter would not ask if a rifle kicks before using it in the heat of battle. That would not be uppermost in their mind; getting the animal down would be.
Why, before the fatal shot was fired, did the editor of the film superimpose a bogus crosshair on the poor dopey caribou? Why do we not see Ms. Palin firing the rifle? Is it because she did not do the shooting?
Finally, look at the way she carries the rifle as the party walks up to the late lamented ungulate. No experienced shooter carries a rifle like this.