SAbrina's age

Sabrina used to be very good at knowing her age. She has now decided to change it. Depending on the day, she is either 1,2,or 18. She is actually 2 and a half. She usually starts with 1, then moves on to 18, then finally anounces her real age. My family and I think its hilarious. Apparently the people asking her age do not, since normally they dont laugh....