Final answer:
Eugénie was able to disguise herself by changing significant aspects of her appearance, such as her hairstyle.
Step-by-step explanation:
Eugénie was able to disguise herself by altering her appearance through different means, such as changing her hairstyle, which is implicit in the references provided. For instance, Bernice disguised herself by cutting her hair — she 'bobbed it' — which was a significant change in the context of the era, suggesting a transformation in her identity or societal role. In the era these narratives are set, a woman altering her hairstyle could be seen as an attempt to adopt a new persona or escape from a prior reputation. Similarly, disguises could also involve changing one's style of dressing, as mentioned in the context of Marie-Antoinette altering her royal image by donning different types of gowns. Such changes could significantly affect how characters like Eugénie in their historical context could be perceived by others, thus allowing for a form of disguise or metamorphosis.