M.C.
Give it more time. Also, is there a way you can observe the classroom via camera or through a window to watch what is going on? Can you invite some of the other children to your home to play with her on the weekend? She may just need time to bond better. Don't worry about her being in time out. All kids act up from time to time and it's good to know the teacher gives gentle but firm discipline to all children. The fact that she goes without any trouble is a very good sign. If you had to take her kicking and screaming that would just show that she hated going and she isn't exhibiting that kind of behavior.