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Then as long as she did not pay more than 1/2 of her own support, she would be your dependent.   You can claim a child that is under age 19 or a full time student under age 24 reguardless of how much they earn as long as they did not pay more then half of their own support.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**