A.N.
My daughter in high school also has an IEP. I have once asked her Math teacher for a test back for a home review just like you've asked. The teacher was very nice to let me do that for a day. It was a test only but not a final exam. I would understand that the teacher put a lot of effort in putting together exam questions which would be used repeatedly and therefore has to guard them for fairness. I think when she asked that you can review it during an IEP appointment, she is already making an accommodation for you.
But of course you are doing so just to help your daughter learn and understand what and how she has missed questions; and possibly pinpoint her weaknesses and maybe ask for any test-taking accommodations (extra time, etc.). I would work with the teachers rather than challenge their authority. I have had a lot of support from the teachers and the case manager in my daughter's classes.