She has brown hair, which is wrapped in a ponytail bun in Nosy Pony and Sleepover. She wears a yellow headband, a purple t-shirt tucked in a blue denim skirt, and yellow rubber farm boots.
Her first name was revealed to be Helen in "Scarecrow".
Helen's headband and t-shirt were both originally green before they were changed to yellow and violet. But she was seen in her original green shirt and headband for several episodes, including the big picture in her room, that she's shares with her husband George, when Annie was just a baby.