Forgive my hat.what does laura apoligise for at the end of the story?

Laura’s walk to the Scotts, her shame at wearing her best clothes and a new hat amid such depraved conditions is a brutal awakening to her psyche. She wants to flee, to return to her own kind but is made to enter not only the home of the Scotts but to see Mr. Scott’s dead body laid out in the back bedroom. Laura's apology is self-conscious and she is becoming more aware of her class privilege and is feeling something is wrong with the world.