Change trusted number on daughter's Apple ID in Family Sharing
I'm trying to sign into my daughter's iPad after a restore and it's trying to send the verification code to an old cell phone number. I've tried going the route of "can't use this #" but when I try to sign in another way it tries to send the verification code to my daughter's apple ID which I also cannot sign into online. What do I do so that she can have her iPad back?
iPad, iOS 10