While you await your appointment with the psychologist, see if the school psychologist can come in and observe her to see if she is doing this for attention from the teacher. Also, my suggestion would be to work with the teacher and try a time system for her to participate in then have a break. Also, maybe the way the teacher presents the direction is confusing for your daughter. See if you can pair her up with a peer to follow the correct behavior as well as complete the day smoothly. Hopefully this will help or you already found your answer.

An alternate angle to view the problem is to assess the classroom and the teacher.  If this is completely foreign behavior for her, perhaps there is some manner of issue between her and her instructor(s) that she is incapable of relating to you.  Interview the teacher, ask loads of questions, volunteer at the school as much as possible.  It could be that some communication failure has occurred between the two parties that you can clear up with a little parental detective work.  The first thing to remember is that you have to trust your child and your instincts regarding your child.  No one else will have her best interest the way you do.  Switching schools (and teachers), waiting a year for her to mature a little more, or simply discussing these issues with her and her teacher together may help.  Do not dismiss her behavior as having no basis until you have all the facts.