There is a workaround your friend can use, until she gets this problem sorted out.
First she needs to add the Styles icon (>) to her Quick Access Toolbar.
(This is NOT the same as the Styles or Change Styles options that we have in the Ribbon!) To do this she needs to click on 'Customize Quick Access Toolbar' then 'More Commands' and follow the on-screen directions. Once she has added the Styles icon, when she clicks on it, it will open up a drop-down menu that will show a list of all the titles of each Style, each one displayed in the 'preview formatting' of each Style's style.
By the way, she should make sure that at the very bottom of the drop-down menu (under the actual list) that she checks the option: "Show Preview"