Cube: Bastion if you have enough max ammo lines. Resilience otherwise.
OL Gear: Focus on Elemental DMG and max ammo. ATK second priority since she gets 95% on her own already. Filler lines with crit. You can ignore hit rate.
Too strong. Best burst 1 and burst 3 in the game. Best fire and iron DPS in the game. Best CDR and even when acting as burst 1 provides amazing damage on her own.