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Yes, it could be related to her heart. Cardiac symptoms can be atypical like this in elderly and in Diabetics. However it is not possible to differentiate without a ECG and clinical examination.
Even a simple stomach bug can also cause these symptoms, but a Cardiac cause should always be kept in mind in those who had nausea / vomiting / palpitations / syncope / sweating (angina equivalents ). She should get an ECG done.
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