Final answer:
Emily's appeal strengthens her claim by using pathos to evoke emotions and desires in the audience.
Step-by-step explanation:
The appeal used by Emily in the given excerpt is pathos. Pathos is the appeal to emotions and feelings shared by the audience. In the excerpt, Emily emphasizes the sense of fulfillment, instant gratification, and the lasting effects on mood and behavior that come from baking at home. These emotional appeals strengthen her claim by making the audience desire those positive experiences and benefits.