I don't know where you're getting your sources from, but AOC clearly doesn't want mass immigration/open borders. However she does want to solve the current conditions of the detained immigrants in the US, and she's saying that climate change is responsible for creating more migrants and refugees seeking relief.
It is significant that 60% of Americans approve 'Allowing refugees from central American countries to seek asylum in the US', and 80% want 'Developing a plan to allow some people living in the U.S. illegally to become legal residents'.
http://cdn.cnn.com/cnn/2019/images/0...mmigration.pdf