Hello and welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. One of the most common causes of these symptoms is an infection. Checking her temperature is recommended at least twice (morning-evening) each day for a couple of days to make sure she s afebrile (or the opposite). Other potential problems may include an arrhythmia (it requires either clinical examination or an ECG to find out), anemia (a simple blood test should be enough to diagnose that), thyroid disease (measurement of serum TSH), etc. Her symptoms are too vague to form a narrow list of differential diagnoses so visiting a doctor is strongly recommended. Hope I have answered your query. Let me know if I can assist you further.