Sylvia can make all sorts of flowers as long as she's read up on them, but she only knows how to make roses at this point, because when she was seven, that was the only type of flower she knew; she never had a chance to try making different types of flowers after the attack.
She also has a natural aroma to her. Her wings have the feeling of flower petals, but they're much more durable and hard to break or hurt. They do take a bit of energy, though, and since her wings aren't trained well, Sylvia has trouble breathing while flying. Also, Sylvia usually smells like chamomile, but she can smell like sleep-inducing flowers sometimes, or when she feels threatened, she smells like stinky flowers with smells meant to ward off predators or whatever.