You only see the "Show Parent Folder" option if you right-click on a folder that has a hidden parent folder. Otherwise that option won't be there. Here's something to try. In the library module, go to the library menu and make sure the option to show photos in subfolders is checked. Then, click on the top most folder in your folder structure. Now you can scroll through the images and, hopefully, find one of those missing images. When you do, right-click on that "missing" image and choose "go to folder in library." That should put that folder in your library folder tree (I hope). Or you could click on all photographs and look for one of the missing images in the same way and try my suggestion.
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