Since its Story Mode and not even Hard Mode ...
"When she jumps away put a pillar between you and her"
"When she summons Feathers, kill them ASAP, Feathers destroy pillars."
"When she jumps to the middle and whines about retribution, big AoE damage, does more damage with smaller pillars, get to the middle after shes done screaming"
"Kick her ass"
"When she jumps, make sure you are behind her OR as far from her as possible"
(IIRC, the Mistral Shriek has a limited rage, so when she jumps outside of the clear space, distance is how to survive.)

BAM now 3 new people know the mechanics of the fight. And all it took was 30 seconds in chat.
Be the solution, not the silent veteran who bitches about new people not watching videos for leveling dungeons.