How does Atticus deal with Bust up Chiffarobe?

In Chapter Eighteen, Mayella is called to the witness stand. She is very distraught and cries in the witness stand, saying that she is afraid of Atticus. She finally tells Mr. Gilmer that her father asked her to chop up an old chiffarobe (chest of drawers) for kindling, but she didn't feel strong enough. When Tom Robinson walked by, she asked him to do it for a nickel. She claims that she went inside for the money, and Tom followed her, pushed her to the floor, and took advantage of her while she screamed and tried to fight back. Then, her father arrived and Tom ran away.