Columbinetta was one of the wooden puppets created using Gramm's Cyber-Technology. Johan Drossel used her to perform simple tasks like fetching Gramm, whom he called his "watchdog", to his tent or putting the Eighth Doctor into a cellar.
Judging by the name, the appearance of Columbinetta was not based on any particular person. Rather it was based on a female character from several 19th century Austrian pantomimes about Harlequin. This made her a likely candidate for performing in Marionettenburg.