I know that MAP can feel like a nice, objective check on progress, but how is she doing in school other than on MAP? Is the reading level possibly due to topping our at the school (since you mentioned they switch schools after 4th)?

The comment that you made about the teacher not really being supportive may be key here, too. That can make the overall situation just difficult for your DD. Kids are resilient, though...I would not worry too much about irreparable harm.