Final answer:
Maggie used positive redirection, a strategy to guide behavior by allowing a self-correction opportunity without focusing on the negative action.
Step-by-step explanation:
The strategy that Maggie used when she asked the student to go out in the hall and come back in appropriately is known as positive redirection. This technique involves guiding a student's behavior by redirecting them towards a different, more acceptable action, rather than focusing on the negative behavior. It aims to provide the student with an opportunity for self-correction and to make a better choice without escalating the situation.