The online version comes with two options. you can play what they call a 'challenge' game where you aren't allowed to check words before playing them, and 'regular' where you are allowed to keep on trying until you get a word spelt correctly.

I've no idea if my opponent is badly dyslexic, but if she is, I would have thought that she wouldn't be keen enough on Scrabble to have played over 160 games?

For mild dyslexics like my youngest son, there's a still a game to play even with poor spelling. Henry (and Richard) both play better tactics than I do, even though I have better word knowledge. Their ability to spot a way of playing a high scoring letter on a bonus square means they will often find a better move than I will - even though the Scrabble program will reject many incorrect spellings.