What type of Apraxia does your son have?
How old is he?
Apraxia, is a motor planning disorder... which can affect various things... from eating to speech to motor movements and articulation and skills.
Now, it seems that his school, 'requires' a 2nd language. But the question would be, WILL your son, have a Communication Aide, in class with him???
He would need one.
Hence your IEP.
Here are good links per your post to help you:
IF the Teacher will not call you back, you note this down. YOU should be keeping notes... per DOCUMENTING things, and what you have done and asked and whether you have gotten a response and what that response was. This is important... per your child/his case and the IEP and in regard to the IEP team.
SINCE the Teacher, will not call you back... then, ALSO e-mail her. AND again, reiterate your questions and that you have called her but she has not called back.
You need to do this.
And document everything on your end and what they tell you.
My friend, who's child has an Aide at school, does this. It is crucial. As the parent. And for my friend's own documentation per her child and what services her son is getting or not... and per the IEP and team.