I think that legal advice is much lower on the priority scale than psych and medical at this point. Now, if the school were to fire back with truancy charges (not bloody likely) then maybe.

I wouldn't-- YET-- send that letter of understanding to the school.

I'd try to get in touch with your previous two professionals for a "quick consult" re: educational issues.

At least that will let you spitball on the bottom of your meeting notes, insisting on a MEETING to determine eligibility. Your position long-term will be MUCH stronger if you take the time to do that now.

Schrödinger's cat walks into a bar. And doesn't.