What is an example of verbal irony in "Raymond's Run"?

Verbal irony is when someone says the opposite of what they feel or actually mean. When Squeaky comes across some girls in the neighborhood, including Gretchen, they get into a battle and insult each other. The girls tell Squeaky that she is not going to win the upcoming May Day races, and they also try to pick on her brother, Raymond. She responds by telling them that they have to talk to her, not Raymond. When she walks away, she thinks, "I continue with my breathing exercises, strolling down Broadway toward the ice man on 145th with not a care in the world cause I am Miss Quicksilver herself." Squeaky says that she has no cares and that she is without trouble, but that is not actually true. Her mind is on the upcoming race, including her rivalry with Gretchen. She also has to care for her brother, Raymond, who has intellectual disabilities and who causes her a great deal of concern. Therefore, saying that she has no cares is an example of verbal irony, as it is contrary to the truth of how she really feels.

Verbal irony happens when a speaking character says something different than what the literal or usual meaning is. Verbal irony is intentionally done by the speaker. Three common types of verbal irony are sarcasm, overstatement, and understatement.  
A good example from "Raymond's Run" is when Squeaky comes across Gretchen, Rosie, and Mary Louise. Squeaky and Raymond are on their way to the races when they come across the three girls. A little bit of smack talk ensues. One of the girls then decides to start talking to Raymond. Squeaky is absolutely not having any of that. She's there to protect her brother. She tells the girls that if they have anything to say to Raymond, they can say it to her. Rosie responds by asking if Squeaky is Raymond's mother, and Squeaky says yes. Squeaky then says that she'll be all of their mothers if they keep talking.  

“What are you, his mother?” sasses Rosie.
“That’s right, Fatso. And the next word out of anybody and I’ll be their mother too.”  

Obviously, Squeaky knows she is not Raymond's mother, and everybody knows she can't become a mom to the rest of the girls. It's verbal irony because what Squeaky says is not meant to be taken literally. What Squeaky means is that she is protective of Raymond like a mom. She also means that she can and will enforce punishments on the other girls like a mom would.