Mom occasionally beats me in Scrabble, even many years after I think she can't do it any more. There's nothing better than being surprised by your mom's mental acuity just when you think she's getting older.
This was not one of those times.
It might simply have been the letters. But on several of her turns, I pointed out a number of locations where she could score twice as much using the letters she just placed on the board. Even with that help, I played a bingo and won by a large margin. And without using the new two-letter words from 4th edition, with which she is unfamiliar (QI, ZA, etc).
Maybe next time.