Get your taxes done using TurboTax

You don't have to enter it in Box 5, 

rather, in the Education section, after entering Form 1098-T (since you say she has one, if not you can by-pass the entry of Form 1098-T in that section but continue to this specific screen) 

there is a screen that asks if the student received any other scholarships not reported on a tax form.

Enter the 6,600 there.