I seem to have missed the whole "can't read" thing, but what's the overall context? Does she have a severe learning disorder that drastically impedes her ability to see the words straight on the page? Or are we leaning more towards the "couldn't be arsed learning properly in the first place and never bothered trying to fix it" end of the spectrum? 'Cos the way I see it, one of those is totally excusable, the other is less so. There is a *LOT* of reading in most people's everyday life, and if you're just not making the effort even though you're perfectly capable, then you're not really to be commended.
Do excuse me; most of my vitriol here is aimed at this marriage-destroying home-wrecking illiterate ****pig I know. But my point stands. And even if you do have a severe learning disorder, it's not like there aren't trained professionals out there who could help you if you were willing to just try.