Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. It seems that you have got some degenerative process in the cervical spinal vertebral joints and due to that there is limitation of the movements in full angle. These verterbas are very commonly involved in osteoarthritic changes and lead to pain and limited mobility. For your main issues of the neck mobility, you need to consult an Orthopedist and he is the personnel trained to deal with such issues with perfection. He will go for a thorough Physical examination and some diagnostic tests and will treat according to the MRI findings. Relaxation therapy would be best instead of taking some medicine and for that she has to see the concern center, and even better than this is to come out of the stress, Tab Chlorzoxazone with Acetaminophen can be tried, and hope this information helps. Hope I have answered your query. Let me know if I can assist you further.