I remember the name Alisan Porter as her role of the girl Tess on that episode in which she caused trouble for the cousins--and the Chicago Chronicle crew! I remember she wrote "Tess was here" on someone's sweater, as well as touch all the buttons in the elevator, slowing it down.

Story here http://omg.yahoo.com/blogs/now/curly-sue-star-grown-175126010.html

Never heard of "Curly Sue," unfortunately.