DD is kind, caring, sensitive and a loyal friend. Her "best friend" at school is less so and somewhat fickle with her affections, telling dd from time to time that she isn't her friend anymore, dd can't sit by her and such like. "Friend" strops/sulks if dd doesn't do as she wants, so dd usually does to keep "friend" sweet. I think "friend" is completely aware of how she's behaving and playing dd. I hate to see dd upset. How can I help her build her emotional resilience and develop strategies to deal with such scenarios whilst not negating her kind and caring nature. DD is an only at home, two grown up brothers.