How do ii unlink my daughters phone from mine ?

You are sharing your Apple ID with your daughter and that is the problem. Apple ID's are not meant to be shared. Each of you should have your own.

You don't mention how old your child is, but this link may help you --> Help your child set up an iPhone, iPad, or iPod touch - Apple Support

Then you can use parental controls to manage her iPhone usage --> Use parental controls on your child's iPhone, iPad, and iPod touch - Apple Support

Make sure she is using her own Apple ID and not yours.