Hi, welcome to our site. I am Dr Saumya Mittal, MD. Read your query. That is a very significant question and i appreciate your problem. I will try my best to answer your query There are a huge number of possibilities. In view of the recent infection, there is a possibility of recurrence of the infection in another part of the body, like nervous system. There might be other infections affecting the nervous system like malaria. There is a possibility that another infection has developed, like say a simple sinusitis that can cause both headache and fever. A simple cold can cause both the symptoms. Headache may be an associated feature of the fever. She needs further examination and investigations. I therefore suggest that you have er examined by a physician as soon as possible I hope this helps you. Inform the reports mentioned above/if any other so I can be of help further. Best of luck. I have given you the answer to the maximum considering the information provided. The results of the tests could further enhance my answer to you. Please do understand that some details could be extracted from a detailed history and examination. Please feel free to ask another query. I would be glad to help you. Looking forward to your return query with the details asked so that I can help you further. (If the answer has helped you, please indicate this)