Heather crawls from her room into the hallway to look for her mother after she leaves.According to Jean Piaget,this shows that she is capable of:

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Heather's ability to search for her mother after she leaves the room shows that she understands that objects (in this case, her mother) continue to exist even if she can't see them (object permanence). This is a milestone that typically occurs in the sensorimotor stage of Piaget's theory of cognitive development.

Heather Crawls from Her Room into the Hallway to Look