Good luck at the meeting. I could have easily written and received the same email from DS's teacher. She continues to tell me that no Kindergartner she's seen in 20 years can "actually" read and that DS needs to practice coloring or he will not be able to complete elementary school. She has told me that I have overestimated his abilities and when she saw his test results, she actually said "Well since you paid for them privately, you can buy anything these days...." Uh.. yeah whatever. I bought an IQ score???
We have had less than stellar results so I'm not good at advice. I can tell you that we always have the Principal or the school learning specialist in any conversation now. If your district has a learning specialist, psychologist or other person who generally would sit in on an IEP, you may want them to participate as a third party.
Now as a teacher, I can say that the part where you said that she can't teach him at his level, would have seriously pissed me off. I KNOW what you meant but it does imply that she does not have the ability, not the time. Like she's not smart enough... which she very well may not be! Try to deescalate- perhaps even apologize so that you may be able to have a conversation.
