My daughter is on my apple music family plan all her playlists keep getting added to my phone. How do i make this stop?

Are you really using Family Sharing or are you simply sharing an Apple ID with your daughter? If you are sharing an Apple ID, there is nothing you can do to stop this behavior. If you eat h have you Owen Apple IDs and are using Family Sharing according to:

Set up Family Sharing - Apple Support

Family Sharing and Apple ID for your child - Apple Support

then just don't share the playlists. See the "Share a playlist through Apple Music" section in:

Create and share Apple Music playlists - Apple Support