Am I getting these signals from this girl right?

Ok so I go to church services with this what we will call very attractive girl/young woman about 3 years younger then me (Im 19 shes 16, so it wouldnt work for about 2 years anyways). And with in about the last 3 months shes been acting different around me. Smiling at me while i'm talking, laughing at my terrible jokes (she could just be being nice)....Shes been kind of touchy feely with me. Like gently fake punching me and rubbing my upper back and chest. >.> Am I getting these signals wrong or is she just being nice?