Andrea is a typical 11-year-old whose growing self-consciousness and self-criticism drive her to frequently compare herself with her peers. if andrea is like most children, such comparisons will

I believe the answer is: Reduce her self-esteem.

For children on average, constantly comparing to other peers especially those who possess something that they do not tend to create a sense of inferiority among the children.
It is important for the parents to teach the children on how to accept themselves as unique individuals during this stage of development.