I haven't been keeping up with part 2, but since when did Helia get such a fire design?
She got depressed when Coralie "died" in the simulated universe, got PTSD flashback and unlocked new valk suit via delusion, essentially. The suit itself was implied to be a byproduct of mental stability module of Hyperion to prevent her from going full psycho, hence why it have elements of older valk's suits and abilities.