I'm thinking of taking away my niece's flower girl duty the day of the wedding
Why would you exclude your niece from being a flower girl at your wedding?
She's just too young for this kind of thing.
She was probably really looking forward to this. You shouldn't take it away on the last minute like that. This could really crush her.
I can't believe I have to deal with an annoying brat like my niece.
Your wedding is coming very soon and dropping your niece at the last minute is rude and inconsiderate. She has put alot of time and effort into preparing for your wedding. Show your generosity of spirit and include her in.