Since your daughter is a resident of DC, all her income is taxable by DC. That said, she will receive a credit for taxes paid to other states. She should allocate the income earned while working in each of the other states to that state. There is a screen in each state tax section of the program where you allocate income to that state. The fact that her firm is based in NY has no relevance beyond the fact income she earned while working in NY is taxable by NY.
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