can you get into the icloud account ?
that would have been the way to do it originally is to reset the password ***** the apple account that she was using on the ipad.
If that was not possible because you didnt know any security answers or have access to the alternate email or cell phone than they would have told you to reset the ipad to default. that loses everything that was associated with the old account but returned the ipad to you in a usable form. If that is the case there really isnt anything that you can do except make sure that you keep your security recovery options up to date on everything you care about.
you can try this software.