Depends on the energy consumption of her body. If she is ingesting less calories than she is expending then she will start to use her body's energy stores (fat) to make energy to keep her cells working happily. Going less than 1500 k/cal a day isn't healthy, so anything above this is reasonable as long as the diet is balanced, vitamin and mineral requirements are being met, and you are working off more calories than you are consuming.
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