AITA No fun aunty?...

AITA or not letting my niece enjoy the small things because she constantly having behavioral issues. For example there was some school works she missed because she was out sick. The teacher sent home a list of things she needed to complete at the beginning of the week. We are asking her and asking her but she says "She didn't give me a list or I don't know where it is." On that Thursday night @10pm she says "Oh I think this is the list..." I feel like she knew she had it but didn't want to do the work. Understood she's a kid but she shouldn't expect to go outside or be able to play her game. She lied.