I was hard headed about the Valkyrie Queen. I had played the whole game on Hard and I was determined to beat her on the same difficulty. It took me 200+ attempts, but I finally (FINALLY) beat her. The best advice I can give is... choose your moments. If you try to spam her while she is in an attack you will get hit. On Hard, 3 hits and you're done. Every time she goes airborne throw the axe to knock her down. Use arrows to your advantage and wait to use rage till the end. You have to learn to dodge every move. Memorize and you'll make it. It's hard as hell, but rewarding when you finally conquer her.