But she voted for it.
Yes, she did. As did 76 other Senators and 297 Representatives. So pinning the blame on her for the Iraq War is a bit off base. And while she (and all those other folks) voted in favor, she was not involved in the conduct of the war. That was all Executive Branch. Bush ordered the invasion, and his administration handled (or rather, failed utterly to handle) the subsequent occupation.
But she didn't challenge it. She just went along with the flow. There were senators and house members who openly opposed it. If she had the courage of her convictions she'd have voted against it. However, that assumes she has courage or convictions.