If she provided over 1/2 of her own total support using savings (for example) that means she was not your dependent child and also means you did not provide over 1/2 of her total support therefore disqualifying her as your qualifying relative dependent as well.
Factors to consider for determining who provided over 1/2 of her total support are listed here in Publication 501.
You should also consider Table 5 in Publication 501 for determining dependent status. In calculating gross income for the qualifying relative test, only interest earned on the savings account during the tax year is income not the total amount in the savings account.
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