Kate Wilhelm 
Let the Fire Fall [EPUB ebook] 

The alien spaceship landed in a cornfield. Its crew died rapidly, leaving only one survivor — a baby, conceived on an unknown world, carried in its mother’s womb across space and delivered even as the mother died on a hostile Earth.But the alien woman had given birth to more than a child. With her last act she had bequeathed to the Earth that hated her and her kind decades of turmoil and strife that would come close to tearing the whole planet apart.