Answer:
Marie should find some way to stop this before these labels become part of her daughter's developing self-understanding.
Step-by-step explanation:
In the question above, since the babysitter has been calling Marie's daughter as a bad girl or naughty, it would lead to label the child as the same while developing her self-understanding.
In psychology, the term "labeling" is determined as a process through which an individual's behavior and self-identity are being influenced or explained by various terms that are being used to describe him or her.
Self-understanding refers to an individual's "self-concept" i.e, his or her understanding of who he or she is and what makes him or her significantly unique.