I agree that Galadriel is powerful. I NEVER denied that. I admitted it already way back in page 2 that she's very powerful indeed. But I'm picking on your statement where you were saying that "she doesn't need any weapon to beat the crap out of Aragorn".
No matter how powerful she is, she would still need some weapons and physical abilities to kill Aragorn. Not just a mere power inside her.
Tolkien stated that she was perilous because she has a very deep wisdom and perception to whatever that's going on around her. She was perilous, just like how the Witch King is perilous, just like how Sauron is perilous, but even they have weapons with them.
Toughness and years of existence do not guarantee your victory in fight
I agree to take a quote from the book Beregond exclaimed, "How can he win to the gate if those Hell-Hawks have other weapons than fear!"
This is just and example Gandalf is powerful, Sauron is powerful, the Witch King is powerful, Morgoth is powerful yet they all use weapons. She may be powerful but she's not invulnerable. She might use spells and even if she could block weapons she would still need a weapon. She's not going to win if she doesn't have weapons. This is not the incredible Hulk were talking about. We are talking about a powerful Noldor who isn't supreme. If she was she would have defeated Sauron. I rest my case.