Notice that for all substances, the heat of vaporization is substantially higher than the heat of fusion. Much more energy is required to change the state from a liquid to a gas than from a solid to a liquid. This is because of the large separation of the particles in the gas state.
Aneeds a full plan is needed because you just can't go off low calories alone she needs a chart for what she eats from morning noon and night and stick with diet and exercise is also a necessity