Ivy is well aware that how emotional Ren is about his duty which always comes first for him. There is not a lot which the girl would be able to do in the days to come because the gates to the Otherworld are being opened.
Jennifer L. Armentrout has written the story of war and love in which Ivy is confused as she wants to win both things. From From Blood and Ash to The Crown of Gilded Bones the author has tried to take love side by side. Even here when the fate of the earth is at stake, Ivy is worried about her love life more.