Answer:
The two lines shows that she doesn't have any power to do anything on her own, is defending herself from the wrongful depiction of her character and her reluctance to be portrayed as someone she is not.
Step-by-step explanation:
Out of the whole two-page passage of Jamaica Kincaid's "Girl", the girl got just two lines for herself while the rest of the narration is commanded by either a mother or grandmother, commanding her on what to do and what not to do. These two lines :
"But I don't sing benna on Sundays at all and never in Sunday School "
"But what if the baker won't let me feel the bread?"
shows her as someone who is wrongly depicted, and doesn't have any power in the relationship with the other person. When she speaks out, she is defending herself from the wrong assumption that is depicted to be her character. And above all, her job is to take in all these commands and obey them in order to be a woman as being a woman is going to be a really complicated process.