I spend a lot of time looking after DD friend, and have come to really dislike her. She is quite mean to my DD, always trying to keep her out of conversations with other friends (I've seen it first hand many times) and trues to exclude DD. Unless it is just the both of them ( they go to lots of after school activities) then she says DD is her best friend. I find her as a person very sneaky, charming to get her way and I know she lies. They are 9. It is unavoidable they hang around together - not sure how to deal with her? I get very upset when she excludes DD and somehow tries to blame her. How should I handle her?