My email is gone and my daughters is there instead
I am assuming you're using an iPhone.


First go into Settings, scroll down and you should see "Mail, Contacts, Calendars". Tap on this item and you will see all the accounts that has been added to the phone.
From there you can go to your daughter's account, disable her email, and go to your account and enable your email. That should solve the problem.


Here's a screenshot of the Mail item.