In "To Kill a Mockingbird", how does Scout and Calprunia's relationship change during the first school year?

In chapter 3 we see Calpurnia in a motherly role.  She has her own family, but sometimes she becomes the motherly figure in their house.  When Scout brings home Walter and makes fun of how he eats, it wasCalpurnia who "requested[her] presence in the kitchen."  She scolded her and told her that Walter was her company and he deserves respect from her no matter what.  He was their guest.  Then "she sent [Scout] through the swinging door to the dining room with a stinging smack."

Then when she came back home from school that day, Cal had missed the kids and made a pan of crackling bread for them.  She even gave Scout a kiss as she sent her outside to play while she finished making dinner.  Scout was suspicious and said that she must have been "sorry and too stubborn to say so." 

Cal plays the role of both the cook and a mother.  She corrects Scout when she's wrong, but she also shows affection. Atticus is the parent, but he and Cal both share the same values, so they compliment each other on how they raise the kids.