So just because a product is made in the same facility does not mean that it is contaminated, it's possible, and likely, that if it is labeled gluten-free, then it is in fact gluten-free. Why are you assuming that there is contamination? What is the product?

Feel free to let us know how your cruise goes with the gluten-free options. 

Here is more info about how to do a gluten challenge for a celiac disease blood panel, or for an endoscopy: and this recent study recommends 4-6 slices of wheat bread per day:    

Thank you for your help. I will try and get biopsy scheduled soon

It is fine to keep her gluten-free at this point, and she can do a gluten challenge if you decide to get a formal diagnosis and do the endoscopy. You did not mention the reference range for her test result, as they differ depending on the lab, but the fact that she had a positive test AND feel better when avoiding gluten, make it very likely that she has celiac disease. This article might be helpful. It breaks down each type of test, and what a positive results means in terms of the probability that you might have celiac disease.  Here is more info about how to do a gluten challenge for a celiac disease blood panel, or for an endoscopy: and this recent study recommends 4-6 slices of wheat bread per day: