all credits go to playstationtrophies.org
Personal note: i think this enemy is quite hard in relation to the story progression - or is it? i really don't know ...
Story related, cannot be missed.
Uppercut to knock her off balance, then punch and grab her to throw for massive damage. You can't dodge her fireflies, so just stay out of the way. When she teleports to the middle of the arena she will spike the area below the platform; quickly jump on the platform to avoid getting hurt. At 50% health she'll stay on the ground and constantly teleport around. Simply wail on her whenever she materializes. When she stops and looks like shes preparing to charge, back away from her thunder cloud; you can't dodge this attack either. She will eventually split into two, then three, when she's at 30% health. The same strategy applies, although you'd want to focus on one target instead.