I just read this article about how (at least with relatively short words) correct spelling is pretty much not related to comprehension. This made me smile because when they were handing out 'spellyness' before Velvet was born, she thought they said 'smellyness' and took a pass. Also explains to me why she can read what she writes perfectly well. So I feel validated in my decision not to be an ogre and drill, drill, drill correct spelling until we have tears and draaaaaaamaaaaaaa.
Besides, why else would spellcheck exist, if it isn't to help people like my Velvet?