It is Carlsberg’s belief that the goal of the Greys is to create grey-human hybrids. Although she is of the belief that the purpose of such a project is nobler than many think. She would state recently that she believes they will integrate the hybrids into our world to help save it.
She would continue that it is her belief they have been here forever. And this is just one more upgrade similar to when Neanderthals and Humans existed at the same time.