Aliza is an 11-year-old girl interviewed in What's Your Favorite Word? Her favorite word at the time is "acting".
Acting Aliza is thus a natural nickname for her, to distinguish her apart from the Sweet Aliza who has a different appearance and favorite word.
She resembles the "Dream Sandy".
Interview for WYFW[]
My favorite word is "acting". I love this word because acting is one of the many things that I love to do. Whenever I'm acting or on a stage, I feel like I can do absolutely anything. When I grow up, I hope to become an extremely famous actress, so I can show the world my gift.