The second best survival option in the game, she can dispel debuffs (some debuffs like panic, induce and stun are lock behind dupes), apply shield and buff the team defense.
She can do some good stability damage with avalanche and her passive can heal all allies at the end of her action, further helping the team sustain.
Doesn't do much more than that at V0, higher dupes helps with her healing, defensive capabilities and buffing the team ice damage but you don't really need those dupes to be honest.
Most valuable dupe is V1 (and even then it's not really necessary) as there isn't a lot of ice DPS options to justify V2.
V1 is the best breakpoint, the rest are just overkill.
The best survival option in the game is still the best.
Shielding for the team on attack (will apply before ambushes), ok ice damage amp, good stability regeneration, and very good CC for hordes when you need a breather (just remember to leave the mobs alone if you have ice seal on them).
Gives her shield uptime a nice boost, very good key get if you already built her.
