The bear with her shiny mummy. If refered to by anything other than her given name, (eg. my little pumpkin, the bear, popsy, etcetera) Arabella is fairly certain to come back with 'I'm a girl, not a .......
She is currently very interested in pointing out exactly who is a girl and who is a boy, offering evidence or physiognomical information to back up her point. Generally in public. Unprompted.