As a teacher of 27 children, 2 accidents in week. That would be a dream for me! I have some children who have 3-5 accidents a day,and I'd never suggest to put the child back in diapers! School is a differnt setting, and because of this children, get involved and forget , it is life! You should set up conference and talk to the teacher about this issue, there are some 3 year old children who are just leanring to use the potty,a gain from experience , that seems an unrelastic expectation. May I ask what type of school is she enrolled in? Is it just a preschool/ day care or is some special school. I teach at a Montessori, and paretns would never be encouraged to allow the children to regress , instead if we have cronic wetter, we instead send him/her to potty every 30minutes to hav ethem try, they eventually get into the routine, and become more self-sufficient. How long has your child been at that school or classroom, that maybe part of the prolem. Finally, ask your child about why they are not talking in school, there maybe a conflict between the child and another child or even the teacher, see if that helps with the problem, or you may want to look into finding a different school if all else fails.