What foods should be avoided if a person has stones in her kidney?

Dehydration. More so than foods, it is allowing yourself to become dehydrated that can prompt problems with kidney stones, if predisposed. With high uric acid, you might have uric acid stones, in which case, should avoid (excess proteins / fats / hfcs), see: http://www.Mayoclinic.Com/health/gout-diet/my01137.
Kidney stones. Dietary alteration depends on the type of stones made. Most stones in the United States are made of calcium oxalate. High oxalate foods such as nuts, berries, cola, coffee and tea should be avoided.