From the Super Mario Wiki
Tammy Treehugger is the younger sister of both Tommy Treehugger and Evil Eric. She appears alongside them in a segment of the Club Mario show, a segment that aired along with The Super Mario Bros. Super Show and The Legend of Zelda. Tommy does not really appreciate her being on the show, saying it was meant for him and Co MC. She is often seen putting on a puppet show and thinks the show will help her become a movie star.