Because it’s expensive to keep a brain dead human alive. I suspect the family is using it as a sort of punishment and extortion scheme hatched by their lawyer.
My take on it is that this could have been avoided all together if the poor child’s family had cooked her healthy food and exercised with her. They wanted a quick fix for her sleep apnea so they had her airway enlarged. That is so sad. Quick fix for breakfast: McDonalds. Quick fix for lunch: Hot Pockets. Quick fix for supper: Dominos. Quick fix for breathing problems due to obesity: surgery. Now she’s dead and they are feeling quite guitly, prompting this nightmare for which they clearly need counciling.