Thank you for your answer.

In reality, she does not use it much and, indeed, often forgets it at home.

But I think he would like to have much more freedom in choosing apps, while instead the installations must be approved by me.

On the one hand, I don't want limit her too much, but on the other hand I want to keep her under my wing because she is still very naïve.

Imagine my status when (the few times it happens to me) I look at his WhasApp and see deleted messages in chats.