"Right away, ... notify the school, IN WRITING, that we are having issues."
My recommendation is to email and mail the note.
Send this message in an email to the school administration. Then immediately print it out, sign it, and put it in the US Mail addressed to the school.
Sending this request through the US Mail helps reinforce your student's legal right to meet regarding necessary accommodations and services within 30 days.
I wish you and your student well. If I can be of service to your student, please contact me.