Lots.
As i understand it, she was a big winner that evening. I cant recall the exact amount. 5 thousand? He was in debt and just happened to be there when he saw her win and decided to rob her.
I don’t have time to research it, but I think you are thinking of a similar but different case. I think in that case the woman won $5000 and the perp followed her home and abducted her when she got out of her car, and I think her body was found in a cabin. Christie, as I recall, was very good at blackjack, and on this night was at first winning, but then was losing.