This year, I just never said anything at all. Let my kid be like any other normal kid.
Last year I had to after my husband told the teachers my daughter wasn't allowed to celebrate holidays, birthdays, etc. I was LIVID he said anything. I told the teacher my daughter could partake in everything and I would talk to my husband. It was never brought up again and was never an issue.
If someone wants to go back to the cult and tell on us, I'll just say my daughter isn't baptized and to stay out of it. Why would they expect her to be held to their rules when she's not baptized anyways?