This sounds like a very simple fix. The next time you see her in person, take all of her devices and download a different browser and set it to a different search engine if you need to (with her permission of course). Put the new browser icon in the same spot as the Chrome icon and move the Chrome icon someplace else on the home screen/desktop. Have her use it and bookmark the sites she goes to most often (or export and upload her bookmarks for her). It will take a little getting used to but it will seem like a habit in a couple of days. Of course you'll also explain why you're doing this.