They certianly seem to be making an effort - and I'm glad your daugher is feeling a bit better.

I think instead of an email, better to send a paper letter along these lines -

Dear Principal -
I want to publicly praise Ms. Classroom for her efforts toward helping the classroom be a better place for DD. Ms. Classroom has provided a reading group with advanced material, science lessons about spiders and insects, enriched language arts, and critical thinking extension in Math. I applaud her efforts, and I hope you will recognize the superlative effort Ms. Classroom has made.
Unfortunately, DD is still reporting that she is yearns for more academic challenge throughout the school day. For this reason, we formally request a gradeskip. Is this something that you can facilitate, or do we need to have a meeting with the Superintendent at this time?

Very Sincerely Yours,
The Lostland Family


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