What quality does the player named Mattie possess that qualifies her for the team's goalie position?

The quality that qualifies Mattie for the team's goalie position is quick reflexes. In the context of playing goalie, quick reflexes are crucial because they enable a player to respond swiftly to incoming shots, attempts at scoring, and unpredictable plays from the opposing team. A goalie must be able to react in a fraction of a second to block the ball or puck, preventing it from entering the goal. This skill not only enhances the player's ability to defend the net effectively but also contributes to the overall success of the team during matches.

While experience in coaching, physical stature, and team spirit are valuable attributes in a sports setting, they do not directly influence a player's capacity to perform the specific and demanding actions required of a goalie. Coaching experience may help in strategizing or guiding the team, physical stature might aid in reaching for the ball, and team spirit can boost morale, but none of these qualities match the immediate necessity for quick reflexes in the intensity of a game.