I'm sure she's still plenty use in fire teams but overall, she seems like wasted potential to me.
Her dual element attack suffers the same problem SR Amon does. That measly extra dark damage may as well just be aesthetics at this point.
Her assist skill is basically there for the sake of her burst effect, but that's a pretty unnecessary extra step instead of simply having her burst give a straight up fire or atk buff. They should have made it so it treats dark element buffs as both dark and fire, that way her dark damage from her first skill would increase as well.
Just because she has multiple element buffs doesn't make her viable in other element teams. It might be useful for Solomon (lol) but really unnecessary. They should have made it fire and dark, that way her assist skill could have had another use.