Answer:
Taking advantage of free time
Explanation:
Time management is the process of scheduling activities to be performed in a specific period in such a way that efficiency is increased. It is a conscious control of the time an individual spends on an activity.
Mandy is planning to use her break period for her foil highlighting service.
She is using the time management strategy taking advantage of time.
This strategy uses any free time one has to attend to certain activities.