Welcome Fawn,
I know her performance in school is fine, so they may think it's not their problem. But she is bringing too much stress home with her.
To start with, have a conversation with the teacher. Ask for a time for an in person or phone appointment. Explain how your daughter's stress has already ramped up into high gear, and alert the teacher to how her desire to be perfect (from writing to behavior) is reflected at home. I would focus on this with the teacher first, and leave the "too easy" aside for the moment. Remember that 2nd grade spends the first month reviewing 1st grade, so the teacher will likely simply respond that it's supposed to be easy due to the review.
How would it fit if every place your said "introverted" or "stressed" you replaced it with "anxious" or "anxiety"? If it seems to fit, then I'd recommend giving her some coping tools consistent with anxiety. Everything you say is consistent with how my DD10 has responded, and the issue is now clearly anxiety. When she was 7, though, I tended to use terms like "introvert," "sensitive," and "stressed." Teach her to calm herself down by relaxing her upper body and breathing deeply. See if you can get any progress by lowering her overall anxiety level by having her spend a few quiet minutes each morning relaxed and breathing deeply.
