Issue with Apple one billing

Hello traductio,

Make sure your daughter is a part of your Family Sharing to share iCloud storage and make sure you are sharing your existing plan. The steps are outlined here: Share iCloud+ with your family

"

To share iCloud+, you need iOS 11 or later, iPadOS, or macOS 10.13 High Sierra or later. For the best experience, make sure your family members' devices meet these requirements, too.

On your iPhone, iPad, or iPod touch

1. If you haven't set up Family Sharing yet, set up Family Sharing. 
2. Go to Settings > [your name].
3. Tap Family Sharing.
4. Tap iCloud Storage.
5. Follow the steps to share your existing plan.
6. Use Messages to let any family members with an existing iCloud+ plan know that they can now switch to your shared iCloud+ plan.

On your Mac

1. If you haven't set up Family Sharing yet, set up Family Sharing. 
2. Choose Apple menu  > System Preferences, then click Family Sharing. 
3. Click iCloud Storage. 
4. Click Share. 
5. Follow the onscreen instructions.

Learn what to do if a family member already has iCloud+. 

"

Take care.