6 year girl attitude

my daughter just finished kindergarden in a private school/daycare and did very well in general. When school ended and the summer program started a new teacher took over and mostly new students up to the edge of 10 are in the class. She is only there 3 days a week and has started behaving rude, aggressive, disrespectful and has started saying things like its all my falt, everyone hates me i dont like myself... this is not normal behavior for her i am very worried that she will carry this to first grade.  I inform her when it is not acceptable to talk or act in this manner and praise her when she does good but i feel it doesnt help much.My 2 year old son is starting to see and inherit some of the nasty tone too. what should i do will this go away ?

[supermomma531]

Have you ever considered that the new teacher may be the problem? It sounds like to me she has only been behaving like this since the new teacher. Or are there any new students? Has there been any new situations in your family life? Maybe a move, or new addition to the family or mom/dad lose or start a new job, new babysitter,etc? Have you asked why she says or behaves like this? Also too, kids tend to start new changes in their personalities when they start school, maybe they have a new friend that may be "cool or popular" and she may be trying to be like a friend.Think back to when this new attitude started. What might have happened around the same time that would have affected her. I hope these thoughts help you out. Good luck.