Answer:
The problem that needs to be fixed in Dorthea's narrative is:
3. In sentence 3, Dorthea should identify herself with a different pronoun.
Step-by-step explanation:
Let's take a look at sentence 3:
3. Every day, myself walks to school with them.
Notice that Dorthea means to identify herself in this narrative. However, she does so with the wrong pronoun. "Myself" is a reflective pronoun and it cannot be used as a subject. The subject pronoun for first person singular is "I". By changing the pronoun of sentence 3 - and also fixing the verb following it -, Dorthea's narrative will be grammatically correct:
Every day, I walk to school with them.