Please notice her way of saying the word 'kost' in this instance is wrong. She is actually saying that she is "Changing her broom". In Danish MANY words are spelled the same way but pronounced differently depending on the words meaning. This IS a mistake she is contioniusly making in the app. Make sure to confire with a ditionary or a Dane/language teaher for perfection. Otherwise you will say some funny things ;-).