No explanation needed beyond "Due to ongoing disciplinary issues and parental behavior, your contract with [day care] is terminated immediately." If you go beyond that, you're inviting an argument. No negotiation.

Tell her in the written notice when she'll be able to pick up her child's belongings.

Tell her in the written notice how you'll be refunding her deposit and the remainder of the care she's paid for, if applicable.

And that's it.

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