Alma, I'll only say this once because it could be construed as a compliment. You're not an example of the average US citizen. Yes, you may fall in the target demographic, but you're definitely not representative of it.
The premise regards knowing who Walters is, not who has heard of her before. As Ugly says, you could easily have seen commercials and not remembered them. Heck, I'll admit to watching TGIF and I couldn't remember the lineup of shows.
Anyway, without conducting a survey I guess we'll never know for certain.