Who is Ginny and what do she and Armpit talk about when he gets home?

When he gets home, Armpit hangs out with his neighbor Ginny, a young girl with cerebral palsy who, much to the surprise of them both has become one of Armpit's best friends. When he tells her of X-Ray's plan, she comments that Armpit can't trust everything X-Ray says, and Armpit agrees.