As a child model, her image had appeared in so many different advertisements by the time she was nine years old that Film Daily commented, "Nancy has been referred to as 'the most photographed child in America,' largely because of her commercial posing."
Som barnemodel var billedet af Nancy Kelly dukket op i så mange forskellige reklamer, fra hun var ni år gammel, at Film Daily skrev: "Nancy er blevet omtalt som 'det mest fotograferede barn i Amerika', først og fremmest på grund af hendes reklameoptræden. "