Jeez, only 4 hits total on your first try? On my first try I got hit about 68 times, and I passed with 2 tokens. Her 2nd form troubled me the most, what with spamming ragnarok and so. Most no damage missions are strict, but this one lets you get hit quite a bit. I also beat Xion's Time Attack in just under 12 minutes, passed with 2 sigils.
When I fought her in story mode, I was meticulous about memorizing her attack pattern in each stage. Not that hard to do once you figure it out, you just have to be patient.