Before speaking or acting, sally examines a situation for cues of how she should react, and then tries to meet the demands of the situation rather than act on her own feelings. she is probably a self-monitor.

The correct answer is a high self-monitor. 

Self-monitoring behavior refers to the way in which individuals behave in different environments and around different people. Individuals who are high self-monitors tend to monitor their environment and surroundings, and accordingly adjust their behavior to fit in with the situation and people around them. Since Sally looks for external cues and adjusts her behavior accordingly, she is a high self-monitor.