Thanks for posting your query.
With the available described symptoms, there could be possibilities of acute viral upper respiratory tract
infection with myalgia
or muscle sprain
after getting injury to neck.
She should go for x ray cervical spine
to rule out any major injury; although possibility appears to be very low.
You should consult with internal medicine specialist and should go for thorough check up.
She should take cough suppressants, throat soothing medicines, muscle relaxants.
She should also perform hot fomentation for relaxation of neck muscles.
Dr. Mayank Bhargava