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Actually, don 't focus too much on showing tones one by one. It is important that she grasps the basic fact that there is 4 tones (+ a none tone), then you can move to real use. Make simple sentences and repeat it with her. I found words are easier to identify as part of complete sentences. Tones become more obvious by contrast with others. Also there is a sort of logic to tones after some time that I never get when someone will explain it to me but I have been able to grasp it by imitation. No need to analyze tones too much, that comes with practice and time only.