I think the consensus here is pretty clear in terms of what Hildryn needs overall, but I'd like to suggest one other thing to add as a passive.
Can we please make dashing (dodge rolling) with Hildryn ragdoll weaker enemies? What's the point of having a lunging dash animation with shielded thrusters if you can't absolutely clothesline some fools with it?!
Also I agree, status buffs should affect her shields instead of health. eg: Viral cuts shields in half, slash and toxin do damage over time to shields, etc... With how hard acquiring her is supposed to be and considering she seems have tech used from arachnoids and orbs, her shields really should protect her health from status effects since those enemies also have that feature.