iPhone child safety

So i have an 8 year old daughter and she splits her time between me and my ex. I asked verizon for a good safe phone for restricting communication to only people i approve. I like all the parental controls for apps and browser and gps, but those are secondary concerns to who she is communicating with. I want her to be able to face time, call, text and email, but i only want her to be able to dend and recieve those communications from people I approve.

I have entered all approved contacts into her address book and set her contacts to restricted so she cant add to and remove any from that list.

I cant find any settings or apps that limit those communications to those in address book. is there any way to do this?

please help, id like to give this to her for christmas, but i wont unless i can assure that she isnt communicating with people she shouldnt.

thanks in advance for your help.