What Is Causing My Daughter's Back Pain And Cold Legs And Arms?

my daughter has brain inflammation and has had since jan this year. she had several lumbar punctures, suffers extreme back pain now and her legs and feet are freezing cold, along with her hands. she suffered low blood pressure whilst sick, and probably still does. what can be causing this and what can we do to help her. i thought perhaps it was a nerve problem after all the lumbar punctures.