It's a bit confusing when 2FA is used on the same device. What you need to realise is that if someone manages to get hold of your daughters password, they can try to do nasty things from their device, but then your daughter would have to agree on her phone (and obviously won't). Security is annoying to some degree most of the time. Not having security can be a lot, lot more annoying.
Whilst I agree security is important but it should not be so intrusive as to make the whole Apple experience devastatingly annoying what used to be as Steve Jobs RIP once said here is a device you already know how to use out of the box.
Well that certainly is not the case today and the future looks even bleaker as the more we as end users allow corporate giants to control our every move destroys any true sense of security. Any form of online security is by its very nature insecure so why when Apple iPhones have NFC technology built in why can this not be the second factor?
this would be far safer as no external influence and you have the security on your finger and NOT over the air via wifi mobile data bluetooth or any other long range hackable signal.
but of course the companies want to know where you are and what your doing 24/7 helping them to sell yet more advertising and generate yet more revenue.
Apple have always been the top pioneers of new useable technologies and innovations from lisa to iPad pro iPod to iPhone and so on, but all we see these days is new iPhones every month iPhone 12 already for release and for what purpose i ask no innovations here just selling to the must have the latest brigade Apple has lost its way and the giant will eat its self unless they create something new and not just revamps to pre outdate older devices this is truly corporate greed and eventually the masses will see the light.
Nobody wants apple to fade away but to do what the company was founded for innovation and respect but now its all about share holders and law suits to stop anyone repairing devices even to government levels to lobby against parts import, This could be supported if any Apple repair centre offered component level repairs at a reasonable cost instead of being told you need a whole new board so its cheaper to buy another device so i guess fairness to its loyal customers is no longer of any importance to the now corporate monster