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Well, the health decrease can't be blocked, but the wind from her Supernova version can.
The blue fire can be extuingished with Water element, but ironically Lunastra is weak to ice. Just step out of the blue fire and you're fine. And if it's widespread, just lure her out of the area with the blue fire. Usually you fight with her in wide areas, so it shouldn't be the big deal.
Rising like a Phoenix, raging like a Cucco! (Not a native english speaker, so feel free to correct me in a construcive way. I'm very much thankful for that! ^^)