As you may know, the letter "S" is difficult for kids to learn. Sarah, being the deliberate and dedicated child she is has worked hard to get them right. She writes her name on everything she draws, but often doesn't get the "S" right on the first try. She will keep writing the "S" till it meets her standards. Thus her pictures are often signed "SSSarah."
My child speaks parseltongue.
In other "S" news, "SuperTarget" is Sarah's Target because it begins with the letter "S". If there are two "S's" anywhere it standards for "Super Sarah"!