Женщина в лифте

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Женщина живёт на 12-м этаже здания. Каждое утро, отправляясь на работу, она вызывает лифт на 12-й этаж и спускается в нём до первого этажа. Но вечером, возращаяясь с работы, она доезжает на лифте только до 7-го этажа, а потом, чтобы добраться до своей квартиры, преодолевает ещё 5 этажей пешком. Почему?

Ответ: