elizabethmom,
Depending on your state, having GIEPs gives you a lot of legal backing. You can have your son tested, force them to have a meeting to discuss the results, and then use the GIEP excuse to push the teacher into discussing the accomodations she legally has to make for your son. In some states, it makes no difference if it is a public or private school. In other states, it makes a difference.
Another option is to have another meeting with this teacher, and the teacher from this past year. That way, you have someone who dealt with him, who is also a professional teacher, to back up your concerns and help respond to hers. It is tiring and frustrating...I wish there was a way to make it simpler.:/