If she used the Online version you have to log into that exact account. You would need to get the username and password from her.
If she used the Desktop program the only copy is on the computer it was installed on.
For Online you can try to find the Account. First LOG OUT of whatever TurboTax account you're logged into right now. Then use this TurboTax account recovery website to get a list of user ID's for an email address. Run the tool against any email addresses you may have used
https://myturbotax.intuit.com/account-recovery/