I think I would say something like - I would like her to experience challenges with a good attitude and to attempt to read more advanced chapter books by the end of the year if it is within her capabilities to do so, attempt to work on multiplication, adding and subtracting 3 digit numbers (or whatever is next in line for math for her) by the end of the year, to continue to expand her knowledge in areas that interest her (planets, history, whatever) and to learn more about things she hasn't already expressed interest in. (And you should probaly say something like...) - Her weakest area is her fine motor skills (as an example) so am hoping she can learn to write more legibly by the end of the year.
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I would also probably write about improving any weaker areas she has first rather than last.
Maybe my response would be inappropriate, I don't know, but I think if I was the teacher I would be looking for matter-of-fact responses that tell me what the parent thinks is logically next for his or her child to be learning.
You know, that might be the way to go. It's concrete and specific without being aggressive. As for it being out of the curriculum area for that teacher - well, she/he could decide what to do (or not!) about it.
