No, it doesn't have to be earned in 2024. If she used money she earned in previous years, that is her contributing to her own support.
From a TurboTax Community Discussion - ''For the support question, the child's need or cost includes room and board, tuition, clothing, travel, entertainment and medical expenses. Support the child provides themself includes earnings from a job or investments and student loans taken out in their own name. For support provided by the parents, you include any direct costs you pay, student loans you take out in your name (parent loans), the value of medical insurance if they are on your plan, and the value of room and board at your home where the child lives.''
Add up your child's total costs, what you provide, and what the child provides, to see if the child provides "more than half" their own support.
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