They aren’t saying she’s dumb because she got easy questions wrong. They are saying she had a huge lead that was more than four times what the remaining questions were worth, and she bet almost half of it on a Daily Double. She could have assure herself, or virtually assured herself a victory if she didn’t do that.
I get that. I just think that some contestants go into game shows thinking they’re just gonna be there to rack up the big bucks so they go for the big bets devil-may-care every time. She was probably mucho careless, there (although some people with that attitude REALLY rake it in), but I don’t think the label of “dumb” fit her via missing a couple of answers.