I am assuming the link you sent is actually http://truecajunpottery.com
Have her go to this link: http://truecajunpottery.com/wp-login.php or click Log In at the bottom of your right sidebar.
Have her click the "Forgot Password" link, she can enter her email address she used to register here. She will then get an email with her username, and a link to reset her password.