My daughter's phone broke and I want to sign into her iCloud account to see when it was last backed up. When I try to log in on my devices, it asks for a 2 factor authentication number that was sent to her device, which is broken. The only other options are to have a text message or phone call sent to her phone, which is at the shop and broken; or to change the phone number and instructions will be sent to her email address which I can't sign into without a 2-factor authentication.
How else can I log into her account without her phone? It's not a problem with my account because I have multiple apple devices to authenticate from, but seems like a major flaw if someone only has one device.