Bumps On Shoulders And Back

So much to say but unfortunately I'm going through a time in my life that I have no time to let the news come here. Moreover, no time to spend with my daughter who blossoms every day a little more and complain indirectly many hours I spend away from her. Their behavior is changing and sometimes is more stubborn (or self-assured), aggressive (expressive) and choramingona (ok, I can not find a positive outlook for this).
is right at the age of the ape: mimic and absorb everything he sees and hears, what one hand is tender one (he says thank you, if you please, sorry) for another is exasperating. Has had contact temperament with children and education are very different from hers and I find myself wondering where she learned to spank us when we get angry or try to close the doors of the divisions in our face. Only recently have come to a birthday party where they were two girls over a year since her performing very violent: they gave toe and flat walls of the house and then threatened to knock on Joan (I think they came to beat him two times, because she came running to me crying and with red marks on his face). It was the first time I saw her refusing to return to play with someone, at least for a while. Then when I offered to go with them, and he admitted that was when I saw his behavior. Past she was also a bit on the toe wall, all fun ... Then they decided to jump off the couch and she fell and hit his head on the floor. When he began to cry, there was just one of the girls said: "WELL DONE! NOW DO NOT jump over !"... I am sad because I pity the climate in which that girl is created. More than once this evening I heard the father telling him to behave well but took a whack at it and scream or say nonsense (to which she replied laughing and repeating the phrase "I shit in your mouth" in the loop ... Surely the parents do the best they can and they think proper, but denote that the girl has already adopted this behavior in order to draw attention ... And now
what's the solution? Shield my daughter to this kind of forever? Let her learn for themselves and hurt themselves at your expense? I do not want to limit their interaction with miudagem, but not like now that we are looking for childcare, she stayed all day with children with this type of behavior.
Moreover, with neglected children. Because after we give them a little attention, affection and inventing games for them they became docile and cooperative with each other ...