fructose malabsorption

My grand-daughter age 4 has been diagnosed (by a breath test) with fructose malabsorption (not intolerance) and is on a very,very strict diet. Please check internet on this before answering as it is too involved to describe on this site.
She had 10 blueberries and now can't focus on anything and even her words are difficult to understand. I suggested humaworm to her mom in case of yeast. I'd appreciate responses. Thanks Tweet