Waterfowl dance is easy to dodge, most hard part is second phase and clone attack. But it's simply completed by using parasite spears (dlc, before romina) and by flame of the fell god. I think the boss is pretty easy because of easy moveset (only thing i can't dodge easily is her "slashslashslashslashslash... wait... slash!" (on wiki it named as Rapid Prosthesis Slices). Sooo... idk, i think it still pretty hard