Unpasteurized miso made into soup (do not boil), you stir in the miso after removing soup from heat, let sit 5-10 minutes, then serve. Miso is fermented soy, and you only eat small doses so it doesn't have the harm we generally think of when eating soy.
Miso is THE food used to treat radiation! Miso helps combat radiation damage! Used after Hiroshima with success! If you could get her to eat one bowl at least once a day for a while that would be very beneficial.