I remember when this episode first aired. When Mary started screaming and whining I was SO angry. Laura (the real one) had stated - both in her books and in interviews and other writings - that the one thing that always stood out for her was how brave and patient Mary was through the whole time she was losing her eyesight, never once cried. She also worked to be self-suffient from the very beginning, learning to do minor chores around the house, like sewing. Making such a wonderful, brave character turn into a whiny chicken just for the sake of dramatic license infuriated me, even at the tender age of 13.