Managing Kid’s Accounts

Recently my daughter's email account asked her for her date of birth when she first signed in, that is where the problem began. She was working on her iPad and accidentally hit 2001 as her birth year but she meant to hit 1998. The page then loaded to a new page and it was too late to change it back. She is now recognized on her account as a child under 13 and needs me to sign in every time she needs to use her email account or any account hooked with her mail (Facebook,Instagram,Skype,Twitter). When I sign into my account to give her access to her accounts it will not let me. I also checked my account details and her account is not under Kid's Accounts. How do I solve this problem ? I do not want her account to be hooked with mine as a kid's account.