Final answer:
The art style used by Jennifer, who integrates herself with her art as part of an exhibition, is likely Performance Art.
Step-by-step explanation:
Jennifer, as an artist who includes herself as part of a living artwork in an exhibition, along with a statue of a horse, is likely engaging in a form of Performance Art. This approach is characterized by the use of the artist's own body as a medium, alongside more traditional art forms such as sculpture, to create a live, interactive piece. Unlike Pop Art, which is known for its clear imagery of popular culture and the rejection of abstract expressionism, Performance Art is more about the experience and the act of the art itself, often with temporal dynamics that exist only in the moment of its performance and the presence of the audience.