User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-5110811-20160215214214/@comment-87.241.116.232-20160221140937

Read the wiki... http://supernatural.wikia.com/wiki/Eve

"Eve was part of existence before  angels, which gave her an advantage over them, being able to inhibit them from using their supernatural powers, and possibly kill them"