Sorry to hear your wife's troubles. I am a diabetic and very susceptible to hypoglycemic episodes. I have walked three Caminos and I always carry a fast acting glucose item with me. There are many on the market, but a few sugar cubes will work...
22 kms with 960 m elevation gain in 6 hours being more than sixty can make some problems. I think yoo should slow down and make more stops ( for your wife) on walks of this level of difficulty.
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