What she means:
when Starfire was lost in the blizzard and felt so disoriented and alone that even her alien body couldn't ward off the cold of a Russian storm, even though she has survived the cold of space, she uttered Robin's name in the moment she knew there was a chance that she collapsed and might not make it. through everything, she has faith that he'll somehow find her and save her just like he always does. and at that same moment, Robin wants to run after her because he knows she needs him and is just so worried. their bond is so strong it makes me want to cry.