You can re-name her account in AD and it will not change any of her permissions or any memberships of groups and will also keep her old email addresses so she can still receive emails from people who are not yet aware of her name change. In AD also go to the email addresses tab, create her new email address and make it the primary SMTP and do not delete the old email addresses. That will change her name on all mail she sends and also when people hit “reply” it will be the new name. Her mailbox content and structure will not change either. I had to do this for myself 3 years ago.