login teamviewer with different account

Hi,

Both my sister and I have a TV Free account for personal use: Mostly I use TV to help her with computer issues.

After update to TV 13 she accidentally used my TV account instead of her own account. Now she cannot start TV with her own account, because each time she starts TV automatically my account is used to connect to the TV server.

What action must she take to allow access to TV with her own account?