How to get a User back into Tessitura Web/On the Go?

I have a staff member who got onto Tessitura Web, but is pretty sure she saved the dual-authentication QR code to something she shouldn't have and now can't find. And since her Citrix one won't work, she can't get back in. 

I gave her instructions to use Google Authenticator (we use Chrome as our default internet server), but that only works as a first-time set-up. Since she's already done it once it won't let us add the Google Authenticator. 

Is there a way to "delete" her On-The-Go account enough to redo her login? Her username and password are otherwise fine, it's just the dual-authentication that needs to get fixed.