Final answer:
Ximena's attitude is best described as optimistic because she is hopeful and confident that things will improve in her new school situation.
Step-by-step explanation:
The word that BEST describes Ximena's attitude is Optimistic. Ximena is facing the challenges of adapting to a new school with confidence and notices small improvements every day. This shows a positive outlook towards the situation and a belief that things will improve. It is evident that Ximena feels hopeful and confident about the future, which aligns with the characteristics of an optimistic person. Being optimistic can increase an individual's chances of persisting in taking action steps toward their goals, despite the fact that not everything may be in their control.