Viral Meningitis?

My family and I went on vacation to Tennessee, during which my mom's joints began to ache.When we got back she had a headache all over her head, a stiff neck, and her eyes hurt. This was nonstop for a week. The first diagnosis was Lyme Disease, and she was put on antibiotics. She did not have a bull's eye like bite mark at any point that is a trademark of Lyme's. Over the next week or so the joint pain left and she just had a constantly stiff neck and the headache. The next suspect was that she had been bitten by a mosquito in Tennessee that was carrying West Nile, and she had West Nile Virus. The doctors also thought that Rheumatoid Arthritis and Meningitis were possibilities. She got tested for West Nile, but it came back negative. She also evn had a spinal tap done, but it came back negative for Meningitis. Doctors are again saying they think it's viral meningitis, but the test was recent, and no one in the family has caught it. (it is contagious). Any ideas? We're very stressed.