Sherry Alberoni

At age nine, Sherry was the youngest Mouseketeer for the show's second season (there were two younger mice during the first season). She used the stage name "Allen" upon the advice of her first agent, who thought some casting directors might not hire an ethnic talent. Like all second season mice, Sherry's performances are unavailable for viewing today, as the studio hasn't released production numbers from that year on video or DVD.

Though normally assigned to the Blue Team for Circus Day and Guest Star Day audiences, Sherry was also given roles in several Anything Can Happen Day numbers. She recalled in later years that director Sidney Miller would often change her lines to include many sibilants, so fond was he of hearing her lisp.

(source: http://en.wikipedia.org/wiki/Sherry_Alberoni)