I understand how your feelings can be hurt. It's a little rejection. In life everyone won't want to be your friend. Her actions show that she clearly just wants to be a casual acquaintance (if that) with you. If she wanted to be friends then she would have invited you or she would work towards an active friendship with you. I'd find a new group, a new church, or just be prepared to not be invited out by her. You're there for Christ anyways so remain faithful and maybe he'll send some new REAL friends your way.