OMG!!!!!! My mum would never do that to me!!!!!!!
It sounds like your mum told your family you'd do the cake without even consulting you first!!! I know she's your mum but that is very selfish!!!f And a 3 tier cake with only 9 hours to make it!!! What did you do (and say) in the end??? I would say "Mum, you can stay up all night and help me!!! And I'm only doing 1 cake!!! Or I would say "NO way" and why did they leave it to the last minute to ask you?????