Child Apple ID - Set up duplicate notification
How do I set up my apple ID or phone number to receive the same text messages as my child's Applie ID so that I can monitor who is texting or calling her?
iPhone 6, iOS 9.3.5
Use the same Apple ID on both devices.
Set her phone to forward the SMS messages to your phone.
Also accept that she may disable this. And that she may see your SMS messages. To the world, you are both the same "person"