She is a crudely drawn version of Sandy that came to life. Like her other doodle counterparts, she is missing some specific details.
Role in series
Drawn to Life: SpongeBob SquarePants Edition
Doodle Sandys are doodles that later appear in the levels "Space Station" Bikini Doodle "Note World" in NoteBook Land. They attack by karate-kicking DoodlePants. They act as gate keepers and will try and stop DoodlePants from erasing the goo that will open the gates to the next part of the level.
Near the end of the episode when SpongeBob and Patrick defeat DoodleBob and his minions, they realize they still need to escape from the Doodle Dimension, so SpongeBob gets an idea and draws a Doodle Sandy with the Magic Pencil. Then Doodle Sandy runs away and creates a doodle portal, which lets SpongeBob and Patrick escape from the Doodle Dimension and return back to Bikini Bottom.