This wasn’t HER stunt.
The fact that a lot of her fans nationwide turned in today to listen means that while it wasn't her stunt, she owns it.
She made a promise to announce on this show and these guys ran with a rumor that she was going to do it today.
Whether she was in on the rumor or not does not mean that she doesn't have an obligation to her base to quell these rumors. It only would have taken a second. But she didn't bother. Maybe she was too busy trying to decide if she is running or not to send out a two second tweet.