I wouldn’t call it stupid, but probably insecure. Maybe just pay attention to her actions because those always speak louder than words. If she is taking the time to organize a trip for both of you and asking you how you are, which shows you that she cares, she probably has greater feelings for you than you know and it’s just probably your mind playing tricks on you. Just pay attention to all of the little things she does. That’s what will show you how she feels.
From your previous thread, I understand that you have this girlfriend since June and she is very busy with a nursing program. You didn’t indicate anything about her not caring for you, but still you doubt her. Maybe it is difficult for you to believe that someone loves you or cares for you because it wasn’t your experience, as a child. Can that be the reason you doubt your girlfriend cares for you?