I think she would be innocent, after all it wasn't her fault that she was the most beautiful woman in the world. I think to point the guilty finger at Peleus and Thetis, it was their fault. I can somewhat understand though, why they might not have invited Eris, goddess of Discord in the first place. But if they had invited Eris, the Trojan War would not have happened.
I tend to think of Helen as being Paris' co-conspirator. And that's how she appears in my novel, The Rage of Achilles, whose strangely cropped cover is now my avatar. Sorry about the plug. I just found this forum and it looks great.