Fist time-out at school

YaYa told me last night that she had a "sad" day at school. I could not believe it since she was very happy when i stepped in to pick her up. So I asked her what happened. It was not possible for me figure out the truth just based on the pieces of description she was willing to give or she said she remembered. But it was she and another girl named"Ally". Teacher Lia talked to them when other kids were at the table, doing art. Then when they finished talking, they were asked to give another teacher a hug and were allowed to sit in the circle with other kids. But she did not know what she was talked to or about... This morning i had to go to one of the teacher to learn the truth. She and Ally were writing on the back of the board, which was not allowed in the room. So they were timed out and talked to as a individual group. That is what really happened. It bugged me a little that my little girl was timed out at school, but i guess it is no big deal.