I don't believe anyone knew any better . The cheesecake was one of the first desserts that was eaten up . Ella's parents hadn't wanted this to be a time when everyone brought presents for Ella , so she invited her babysitter over the next day , and that was when we had cake . A slice of the carrot cake served as Ella's cake . 
Question: Why did she invite her babysitter over the next day ?
They wanted Ella to have a small private party .