Because of taxable scholarships and substantial 529 withdrawal (withdrawal done to match scholarship), unearned income would easily go over 37% bracket if she does not provide 1/2 support with earned income. I think I have found a table that confirms what we think - Click “visit page” on this site to see the table: http://onlinedigeditions.com/publication/?i=391560&article_id=2735227&view=articleBrowser&ver=html5#{%22issue_id%22:391560,%22page%22:%226%22}
Also, the table seems to confirm that taxable scholarships can be used to pay for room and board, thus further reducing the amount necessary for the child to provide their own support with earned income.