The way I do it, she only gets to petrify once.

Instead of outright bursting on first turn, I just regular attack with my party once with all my buffs activated to build up her rage meter to about half. She usually tries to petrify after which misses because of Amon's buff, which is available to reapply.

Second turn I now use all my attack skills to put her into rage then I burst. All my buffs have already been activated last turn so they're still up. So in my case, she dies here. If she doesn't, then she's is stunned with 5~10% HP, enough for another set of regular attacks to kill.

And even in the case I for some reason couldn't kill her that turn she's stun, Amon's affliction protect buff is still available or up from the 2nd use, giving me another turn.

Though I'm using full light team (no SSR kamihimes) and have been doing this since 30k attack.