Answer:
Optimistic
Step-by-step explanation:
The tone can be understood as optimistic. An optimistic tone is one that looks at the positive aspects of things. It focuses on the things that are good and make us happy as opposed to those that make us unhappy. In this passage, Gloria has an optimistic attitude, because she is thinking of the things that she enjoys at school, and letting those influence her mood, as opposed to the negative ones.