Well, first thing to do is avoid those foods.  Some people are sensitive to certain foods.  My question though is what is she doing to address her condition?  Firstly, what is her diet like, and the first thing I would suggest is a gluten free diet.  The Links below will also give you additional helpful suggestions:

http://www.tbyil.com/Arthritis_Facts_Luella_May.htm

http://www.tbyil.com/Arthritis.htm

My Best,

Luella

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