Yes, if the children were living with you during that time then you can count those days as living with you. She actually left on December 1st and then announced it on the 8th.
Keep in mind that as far as 2021 is concerned you must file married filing separate because you were not living apart for the last six months of the year. The most important factor for your tax return is the ability to claim the children. Keep your records for the number of days the children lived with you with your tax records should you need to show that later.
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