Hi there, Timaree! Adding light rye flour to recipes would be the same as using the medium rye flour that we've featured here. Light rye, or white rye, has the bran and germ removed which makes for a lighter colored flour and imparts a lighter texture to baked goods. We highly recommend that you check in with your daughter and their doctor first to ensure that rye is a suitable choice for them and their sensitivities, rye flour is often processed on the same equipment as wheat flour so there is a chance for cross-contact. 

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