She could consume calories that are greater than 1500 because the baby within her womb will be taking in some calories for him/herself and leave the mother with less food being digested for herself.
Stimulant drug I think would be the best answer
The barriers to exercising are classified as excuses. Excuses like ones physical attributes shouldn't be an excuse to not exercise but a motivator. Time management is another barrier that is classified as an excuse. Even if someone has school or work there is a part of the day that can be used for exercise. Exercising doesn't always have to be an hour in the day.