Cube: Bastion like most shotguns is BiS, but you can also go for reload speed with Resilience.
OL Gear: Used mostly for raids and elemental content, focus on getting elemental damage, ATK and max ammo capacity. Your filler lines can be crit related, you can skip hit rate since she buffs herself.
Good DPS for shotgun teams. Hard to justify bringing her outside that niche. Needs a unit to duplicate stack count of buffs to sustain damage. Extends Full Burst by 5 seconds, making compositions a little bit tricky.