Sarah explained that the driver forgot to pick up flour, so the cost was removed from the customer's balance. However, there was confusion about pepperoni not being on the invoice or order list. Sarah checked and confirmed that pepperoni was not invoiced and must have been missed from the order. She apologized and confirmed that the pepperoni is available this week. The adjusted invoice total was updated to 1,041.03 from 1,135 after removing the flour cost.