Yes she should file to get back the withholding. It won't affect your return. Be sure on her return she checks the box that says she can be claimed as a dependent on someone else's return.
Online is only good for one return per account. But you can use the same email address for 5 accounts.
How to start a new online return
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-onli...
