Hello! @Margin60 Thanks for posting your billing questions. If you’d like to provide your daughter with her own account to make payments you can do so by following the steps from the link below.
http://www.att.com/esupport/article.jsp?sid=KB400580&cv=804
Keep in mind she can also call in to make a payment at 1-800-331-0500 or stop by any AT&T store and pay without having direct access to the account.
Hope this helps!
Charise