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I have gone through your query as well as the reports (attachments removed to protect patient identity) and can understand your concern for her health. Repeated attacks of fever, cold and headache can be due to repeated infections of the body which could be viral or bacterial. Low resistance to infections or low immunity of the body can cause repeated infections.
The values are within normal limits except erythrocyte sedimentation rate (ESR). A high ESR indicates chronic infection in the body like tuberculosis or autoimmune disease or granulomatous diseases or connective tissue disorders. These conditions also lower the body immunity.
In my opinion you should consult a physician and she needs proper work up to rule out these diseases. I am not saying that she has tuberculosis. Tuberculosis is the commonest disease causing high ESR. She should undergo proper investigations for that such as chest x-ray and Mantoux test.
Another reason for repeated attacks of fever, cold and headache can be allergy also. So, if she develops these symptoms after exposure to certain allergens or allergy causing substances, ask her to avoid them.
For low immunity, she can take high protein diet like pulses, sprouts, egg white, etc. Citrus fruits like lemon, gooseberries, oranges also boosts immunity as they contain vitamin C which makes the immune system strong. Proper nutritious diet also helps. Along with all these, she can take vitamin C tablets also daily once.
Revert back after the tests to an internal medicine physician online --> https://www.icliniq.com/ask-a-doctor-online/internal-medicine-physician