This is not due to asthma. This pain is not uncommon in children of your daughter's age and is known as the Da Costa syndrome or internal mammary pain. It is often caused by stress.The pain is not caused by any heart problem so do not be concerned. It usually disappears by itself after a while. Ask your daughter about any possible problem at school such as there being one of the children there who is bullying her or some other concern she may have at school.
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