You should continue to claim her as a dependent on your return. The exact rules are:
A child of a taxpayer can still be a “Qualifying Child (QC)” dependent, regardless of his/her income, if:
1. He is under age 19, or under 24 if a full time student for at least 5 months of the year, or is totally & permanently disabled
2. He did not provide more than 1/2 his own support
3. He lived with the parent (or was away at school) for more than half the year
So, it doesn't matter how much he earned. What matters is how much he spent on support. Money he put into savings does not count as support he spent on him self.
The support value of the home you provided is the fair market rental value of the home plus utilities & other expenses divided by the number of occupants.
Furthermore, there is a rule that says IF somebody else CAN claim him as a dependent, he is not allowed to claim his own exemption. If he has sufficient income, he can & should still file taxes; he just doesn’t get his own $3800 exemption (deduction). In TurboTax, he indicates that somebody else can claim him as a dependent, at the personal information section.
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