How I can remove my daughter from this family I added by mistake

If she is 13 years old or older, see the Remove section in the article below.

Family Sharing - Leave.  *

If under 13 years old, you need to transfer her to another. family.

Family Sharing -  Transfer a child to a different family group - Apple Support   *

If you can't transfer her to another family, some people have been able to delete extra accounts using the steps in the articles below.

How to delete your Apple ID account.   *  

Apple ID – How to Delete.  -

Delete Apple ID (new).   -

You want someone removed from your family sharing. You can do this in the following way for example in iOS.

Tap your Apple ID in the menu settings. Then go to 'Family sharing'. You will see a list of family members. Tap on the family member you want to remove. At the bottom you will see "remove <name> from family".

That's it! Have a great day!