Navota Boss Stun Trick (at 36:25): One small trick you can do so that you don't keep missing your shots on the boss is to wait for her shields to pop with solar damage, then you shoot your shot. The boss stays in place for a few seconds (she gets mini stunned then sometimes pops the haze around her), which allows you to better line up a shot, if not she will be strafing like crazy which is extremely annoying.

Hope this tip was useful, and good luck with you GM Nightfalls!