Hey NiteBlitz! Totally understand your concern - keeping kids safe online is so important! 
I’ve been using Phonsee for exactly this situation and it’s been amazing! It runs completely stealth mode in the background so your child won’t even know it’s there, but you get full access to their text messages, social media, and so much more through a super easy dashboard.
The setup is incredibly simple and their customer support is top-notch if you need help! Definitely worth checking out for that peace of mind you’re looking for! 