I think the key is to make it come across like you are trying to help her, rather than make her think differently.
Not all teachers welcome help or advice from well-meaning parents. Even though you are the expert on your child, this is their profession, and it's useful to approach them with that in mind.
It will be very hard for me not to go in without armloads of data as I am a research junkie, but I will sit and listen to the teacher with an open mind (try to). She has already made my child more miserable than she already was, and I have found that none of the teachers are familiar with HG kids so my go to behavior is to hand out articles. We are also going to let the teacher know that DD has ADHD inattentive type since DD has been scolded repeatedly for forgetting items. We let a few weeks go by to allow the teacher to settle into the year and to get to know DD. I think we waited too long.
DD is now asking not to go to school so this is really tough. I hate that the other school we were wishing to switch to was not the best fit so we are stuck here for now.