The answer is Accomodation.
In Piaget's theory of cognitive development, he announces two phases in the learning process, assimilation and accomodation. While assimilation refers to adding new ideas and knowledge to the already existing one, accommodation refers to shaping the existing knowledge and schemas to deal with a new object or situation.
In this case, Marie already had knowledge about dogs, however by encountering a dog that didn't fit the idea she had them, she had to reshape that idea, therefore, it is an example of accommodation.
