Jean backed up her computers before traveling, and now her bookmarks and browsing history are missing. Leo suspects that maybe Jean's husband played with the computer and deleted them. Absent that, she can export the bookmarks from Jean's Macbook and import them to her iMac.
She can also look for the bookmarks.plist and history.plist files in the home directory's library, copy the folder they're in, and put it in the Safari Library folder of the other computer. She should make sure she make copies this first so she can undo it if she needs. Since Jean did a backup, it's likely that the bookmarks were backed up and a simple restore of the last backup will return them.