You are correct in staying away from this family it is not appropiate for her to behave like this , there should be family correcting her behavior, it is best to keep your daughter away she will make other friends I am sure she isnt happy at her friends rudeness, dont make excuses to her, tell her the friend was disrespectful and you do not wish to have them to your home anymore. If the child decided to say sorry and she wouldnt do it any more you could change your mind .