Age: 40
Gender: Female   
Height: 155 cm
Weight: 60 kg
Activity: Sedentary: little or no exercise

Exercise: 15-30 minutes of elevated heart rate activity.
Intense exercise: 45-120 minutes of elevated heart rate activity.
Very intense exercise: 2+ hours of elevated heart rate activity.

Maintain weight: 1,443 - 100% Calories/day

The number of Calories required to maintain your weight seems low. Please consult with a doctor when considering weight loss. Alternatively, increase your activity/exercise level rather than decrease Calorie intake in order to lose some weight.

In the past, I find being under daily calorie intake works fast. It does not mean dieting, or not eating at all. Eat healthily, count calories if you can, and then just increase your physical exercise. The exercises help lose calories and that makes you go under your daily requirement. It's not just any exercise, it has to be an "elevated heart rate" kind of exercise. Running, jump rope, biking!