I think the article could have been clearer but it sounds like they described the recommended treatments in the previous paragraphs. None of them worked and the child did not "outgrow" her condition as predicted by everyone that they saw. Considering they have seven other children that are not particularly troublesome, the most common diagnosis that it was the parenting to blame might drive the most reasonable parent to seek other options, especially after the horror movie-esque “I want to kill all of you.” and "Four months later, Samantha tried to strangle her baby brother, who was just two months old." Someone might consider it reasonable for the safety of the other children to give up at that point but they continued to seek treatment options.