Your daughter is at an age when she can tell you if something is bothering her. She has possibly noticed that she has an unusual heart beat or pulse.Also she tires readily which is unusual for a little girl of her age.You have noticed that she has a rapid pulse.I am not happy to call any of these symptoms normal.She may have what is called an 'arrhythmia' or abnormal heart beat/pulse. Your daughter should be seen by a paediatric cardiologist who will do all the necessary tests.
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