Guess Who

I was just playing Guess Who with Brita. I guessed her person in two guesses. (It helps that Brita usually answers "yes" to questions when she doesn't know what you're talking about.)
The game went something like this:
Me: Does your person have red hair?
Brita: Yeah.
Me: Does your person have glasses?
Brita: Yeah.
So obviously it's Claire, right? Wrong.
I should have known it was Maria.