I think there are multiple different paths for everyone. Multiple colleges at which any kid can do well. To me, its dangerous to have the notion of there being one right path/school. What happens if you do not get in? Or cannot afford it? Or what if once there, you learn its not the right place for you? Will you transfer or will you hold onto your dream even if its not the right place?
What did you love about Duke? How much do you really know about it? Are there other places where your daughter could be just as happy and do just as well but that wouldn’t require you to live on the streets in retirement?