Answer:
Her body has more fat tissue than muscular tissue. Fat tissue needs fewer calories than muscular tissue to be maintained.
Explanation:
Fat does not need a high number of calories to be maintained so with a low-calorie diet her fat tissue is receiving the right amount of calories to not be modified. The diet should be paired with exercise to lose fat and build muscles, which needs more calories to be maintained. In other words, she will lose fat, build muscles and burn more calories.