When her mommy is sick in bed, jenna brings her a pacifier and a rattle, thinking these will mommy feel better since they always make jenna feel better. in piaget's theory of childhood development, this demonstrates?

In Piaget's theory of childhood development, this demonstrates egocentrism.
The child is observing the world through her own eyes, according to what is happening to her. She knows that a pacifier and a rattle help her when she is sick, so she thinks the same things will help her mom get better. She is unable to realize that what is good for her may not be good for others.

Absolute !