It all depends where you are standing :
I know my own mind
You are determined
He is stubborn
Try to see the positive aspects of any criticism - as in the above example, a more tactful word might have been used. However, you need to know if the behaviour is really difficult so that you can find out why it is happening, and address it. Refusal to co-operate with her peers or teachers could stem from a large number of things including fear of something that is happening in school and which you are unaware of, or jit might just be that it's not what she is used to doing at home, doesn't like it, and doesn't see why she should. Who knows what is going on in the mind of a 4-year old who is having to deal with the huge new experience of school. Give her time - get explicit details from her teacher - and reassure your daughter about the changes she is having to make. Good luck.