I accidentally marked "someone can claim" me as a dependent but no one did.

Yes. You can file an amended return and claim your daughter.

Any unclaimed amounts for the first and second stimulus will be added to your amended return as a refund. I don't know about the schedule for the third stimulus. I am guessing if neither you nor your ex claimed your daughter on the original returns, the third stimulus is just sitting there and you will probably get that sometime later this year.

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