The necklace is ironic in the fact that when the necklace is borrowed it is believed to be a real diamond necklace. When she loses the "diamond necklace" she works very long to repay the person she borrowed from because she thinks the necklace she lost was worth much money. When she gives the money to the person she borrowed from and confesses that she lost it she was told that the necklace was a fake and that she worried and worked for many years over nothing. This is an example of situational irony. She thought the necklace was worth very much money when it was really only worth very little
She most likely made a schedule. No doubt it was hard, but she managed.
The word "crude" generally means raw, unprocessed, and unrefined. Therefor, the following sentences use the word "crude" correctly:
"Despite their hard work, the miners were only able to find a small amount of crude minerals in the mine they were excavating."
"The architect drew a crude sketch of his designs to give his clients a general idea of what he wanted to build."
"The audience booed the comedian off the stage because his crude jokes were very inappropriate."
