Well then, I would look forward to eventually getting sued if this is an actual day care situation. Celiac is covered under the ADA so if you are looking to get into it with the OCR, have at it!
This isn't about a sterileGF environment, this is about GIVING a child a cracker cause it didn't say "gluten". That's a big DUH on the schools part. I agree with trying a written letter explaining things. I would also be on the hunt for a daycare that gets it because contrary to MissyBB's statements, they do exist.
If it is not publicly funded, how would it be a problem? a private provider can take whom they choose, yes?