Welcome, I am Cory.
Please click https://mail.google.com/mail/logout?hl=en to sign out of her account.
Once you sign out of her account, please click "Sign in with a different account" at the bottom.
Click "Add account"
Enter the email and password ***** your account and sign in.
Let me know if this helped you.
If it did, please do not forget to rate my answer.
You can not get live help from Google and this is why you are here at a paid support site.
Please follow the steps below:
I can assist you with this remotely for an additional fee if you would like me to do it for you.
Please let me know.