Can not retrieve Apple ID password
My mom gave me her old iPad but can not remember her Apple ID password. She tried resetting it or finding ways to reset it with no luck. Since then I have tried a hard reset etc and going to iCloud.com to reset password. I keep getting a message that her Apple ID is not found. But on her old iPad in settings - iCloud, she's logged in.
I can't log her out without a password. I would like to remove all her settings and save my own. Any suggestions?
iPad mini 2 Wi-Fi