Jennie is using her body language in the conversation with Lacy. A person could convey a clear message without speaking any word. Body languages could be expressed through gestures, unconscious movements, postures, facial expressions and eye movements. In this scenario, Lacey knew that Jennie is being defensive and does not agree with her because she crossed her arms. She also knew that Jennie could be hiding something from her or is being guilty of something she does not know when Jennie looked at the ground.