After what deadline? Like the application deadlines next year? Yeah... if you don't submit your DAT scores until AFTER the application deadline, you might as well wait for next year. First, they probably won't review your app. Second, if they do, they still have to have spots left to interview you, which they probably won't. I must not be understanding your question... why would you want to take the DAT after the application deadline?
it can take up to 4 weeks for DAT scores to be sent, so she isn't taking the test after deadline.
I would say it depends on school, some posters have said they had interview in feb, which is after their schools deadline