I don't think she forgot what she had. I think she thought he had a full house. Then when she realized it, she had already mucked her cards. That is yet another reason I always flip my cards over at showdown when I am playing live. I am less concerned about the "intelligence" somebody could get from me showing what I was playing vs. the possibility that another player could get a pot he/she doesn't deserve because I misread the cards. If anybody is going to misread the cards, I would rather it be the dealer, because then I think I would have a case to get some relief from the floor. If I screw up, I have nobody to blame but myself.