If she files her own return she would still have to check the box that says she CAN be claimed on someone else's return, even if you choose not to claim her. Are you sure it wouldn't change your return to claim her?
Online is only good for 1 return. But you can use the same email address for 5 accounts. How to start another return in the Online version <a rel="nofollow" target="_blank" href="
https://ttlc.intuit.com/replies/3288574">https://ttlc.intuit.com/replies/3288574</a>
