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Any chest pain, shortness of breath?
This is probably a nerve that was irritated during sex, and bothered again with the walking. If it continues tomorrow she needs to see her doctor just to be checked out. It doesn't sound like an emergency though.
She needs to have those chest pains checked out. There are many causes of chest pain: muscle strain, inflammation of the connective tissue between the rib and the cartilate, hiatal hernia, and many others. Recurrent pain always needs to be checked out though.
You're so very welcome.