Either way, the Screw Attack isn't her only option. I've listed most of her abilities, and I'll wait for someone else to step in before saying anything more.

P.S. Cloud was able to take down Ruby Weapon because he had Materia at his disposal, and he took down Sephiroth after 9 people had just spent the last few hours beating him senseless. I don't see how those two situations are examples of him being capable of breaking Samus Screw Attack.