what symptoms does she have, spod, what tests were carried out and is there is any family history of coeliac disease? Was the doctor an allergy consultant or someone with an interest?
It is difficult to get tests and there are very long waiting lists so they tend only to refer if the child is at serious risk.
Intolerance testing isn't anything you can't do yourself although I doubt you'll get a gp to prescribe gluten free foods unless you've had a formal diagnosis. Have you considered asking to see a dietician?