Kate is uncomfortable. She doesn't want to go, but she doesn't want the other girls to be mad at her. See you later. And then Kate waves, and walks home by herself. She doesn't think she wants to be friends with the new girl, and she will probably have to decide if she is willing to stay friends with Ashley.
Most kids feel a little scared when asked to do drugs, but very proud when they say no.
It's important to remember that the more you say no, the easier it becomes.