Either of these responses could mean that she likes you. She may touch your arm when you say something funny, accidentally brush your shoulder or hands with hers, or gently place her hand on your knee. This is all great, but what if you are not skillful enough to discover the secret that her eyes are hiding.
Of course, every girl is different, but these few common behaviors seen in most girls generally indicate that they have an interest in you past just being friends. You just have to understand the way it cooks. If a girl likes you, she will want to look her most attractive whenever you are around.