If these two don't work, it is necessary to switch to prescription lotions such as Ivermectin (Sklice) or Spinosad (Netroba). Meanwhile, all clothing, linen, towels, etc., that may have had contact with the hair should be washed with warm/hot water.
Moreover, the child should have a CBC (complete blood count), to ascertain that there is no anemia, which can decrease the appetite on one hand and on the other, may be due to inadequate iron intake in the diet.
Children frequently also get bored with the same diet over and over again, so it is important to be creative and presenting the child with new foods, while maintaining a balanced diet.One common observation is that going to a restaurant, will most likely motivate the child to eat more because of the variety of foods.
I also usually advise parents, not to let the children play games on the ipad while eating, and not to play games in general, because it is distracting. Rather tell the child an interesting story during the meal.
Most of all, discuss this concern with your pediatrician, who knows the child best and can give you more individualized advise.