On Android they have something called Family Link where you link a device and mark it explicitly as a kid's device to set restrictions like time usage, banned apps, etc. The only way to change settings is through the parent account. And yes she ran some very clever social engineering to try to get in.

Almost got me once - my wife left her phone unlocked so my kid opened WA and wrote me a message asking to lift the time restriction for the rest of the day. Her mistake was sending an extra "thank you so much" with heart emoji, which I though was off. If not for that misstep she would have got me.

Obviously she was rewarded and we listened to one of the Darknet Diaries episodes on social engineering