Q: block phone number from my daughters phone

Help here >  Block calls and block or filter messages on your iPhone, iPad, or iPod touch

Do you want to prevent her from calling certain people? Or prevent people from calling her? There's no way, on the phone, to restrict outbound calls. If you want to block certain incoming numbers, tap on the i to the right of the number in Phone>Recents. Tap Details in the upper right corner. Tap "Block this number". Note that your daughter will be able to unblock this number.

Your carrier may offer additional options for parental control of incoming and outgoing calls. However, your caller can't restrict FaceTime calls or iMessages.