Athena was a bitch
Wow, who had the idea of creating such a bitchy robot.
I mean think about it, instead of explaining everything to the 'girl' she thought was able to save Tomorrowland, she lied to her and said that she would be turned off if Casey asked to many questions.
Then, instead of following her to Franks house and explaining to them the situation, so that they could together leave quicker without the robots catching up. Instead Casey had to sit all the way to night in the heavy rain and just wait and the lure Frank to come out.