She should have focused her marketing plan on one or two groups rather than a broad range of buyers.
Step-by-step explanation:
The reason that due to which her store got shutdown she did not target the right group of buyers and should have focused on students who like fashion more than other groups. Focusing in on one group is not enough for running the business for long term.
She designed marketing plans for a specific group rather than for the other buyers. A specific group can give profits for a shorter period and limited period in limited percentage while focusing on other groups can gives long term and continuous returns.