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I believe that CC (Calibre Companion) will solve your problem, but of course I am biased.
Once you load the books onto the device, CC can locate books using any calibre metadata, including custom columns. There is no reason to set up shelves, collections, or what-have-you because CC does it automatically using calibre's data. You can with a tap read all the details for a book, including calibre columns and comments. You can mark books read. As a bonus for you the maintainer, you can easily update the metadata for books, which will almost certainly happen as your aunt finds new and different ways she wants to look at the data or finds mistakes that must-be-corrected.
Once you find a book you want to read, CC will launch the reader app of your choice. Most work well with CC (Moon+, FBReader, cool reader, mantano, etc). There is no reason to use the reader's library features.
Try the demo version to see if a) it does something useful for you and b) whether your aunt will accept it.
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