Zahra is most likely straining her neck to reach the bar. This is not the correct form for performing pull-ups. To correctly do pull-ups, one should hang from the bar with an overhand grip, keeping the body straight and aligned with the arms. The movement should be initiated by engaging the muscles of the back and the arms, and pulling the body up towards the bar by bending the elbows. Straining the neck in an attempt to reach the bar is incorrect and could lead to strain or injury. It's important for Zahra to correct her form to avoid any potential harm and to maximize the effectiveness of her pull-up exercise.
The most likely answer is: She is straining her neck to reach the bar.