One more day and it's my birthday party with family

17th, 18th and 19th. Mummy's been telling me about my upcoming birthday party. But mummy's not listening to me, I told her I like Big Bird. All she said was "too late!"
Months ago sometime in April or May, mummy asked who I liked Barney, Mickey mouse, Cookie Monster etc.. I told her I like Elmo, she checked with me again and said "okay, Elmo shall be your birthday theme."
Mummy started doing online shopping buying Elmo partywares as it is not available here. I think she was still trying to find more things when we were there holidaying. Last night I finally saw the big Elmo Mylar balloon 34" by 16". It's slightly shorter than I am, I stepped on the new flattened Elmo and mummy told me off.
Few days ago, I did tell mummy " I like Big Bird" and mummy said "it's too late." But why? I still like watching Elmo's World on Sesame Street but I enjoy the tall Big Bird more.
Well, I shall keep you posted about my party at home as well as in school.