Thanks for using Healthcaremagic,
She is already recovering from viral fever
possibly Dengue, she is also having ulcer in stomach.
During Dengue fever many times platelet count
is decreased and as she is recovering from dengue I presume he platelet cont is normal.
If she has severe neck pain
it may be due to cervical muscle spasm or due to some other cause. It is not a part of recovery this may be some thing else so visit the Physician.
It would be advisable to consult Physician or Orthopedic surgeon.
As she has ulcer problem NSAID should be avoided safer analgesic would be paracetamol
and Tramadol and muscle relaxants may help her.
Local hot fomentation and analgesic gel can also help.
If she is taking any treatment for ulcer it should continue or proton pump
inhibitor can be used as per doctor's advice.
Hope this information is helpful to you
Dr. Akhilesh Dubey M.D.