I don’t think the answer of “no”, is entirely as black-and-white as the expert suggests. However, it may be difficult to prove to the IRS that your daughter did not provide more than half her own support.
First of all, your daughter satisfies the full-time student rule, because she was a full-time student for parts of five months during the year, in other words, the spring semester. That meets the full-time student test for 2020.
As far as support is concerned, your daughter’s support for 2020 includes all of her room and board, tuition, entertainment, travel, medical insurance and healthcare costs, and other expenses. For the period of time she was living with you, you provided support equal to her share of your housing expenses. (For example, if your household consisted of yourself, a spouse, your daughter, and another child, then the support you provided your daughter is 1/4 the total mortgage, food, utilities, insurance, and other housing expenses.)
money that your daughter saved, or that she spent for other people‘s living expenses, is not support that she provided her self.
Depending on how she spent that $50,000 salary, you may still have provided more than half her total support for the year. However, if she indicates that she cannot be claimed as a dependent, and your tax returns conflict with each other, the IRS will send letters to both of you asking for an explanation, and you will have to have the proof that your daughter did not provide more than half her own support.
