I know that this is a bit of a zombie post, but I would recommend adding something about how different cleaning materials might react with different pen materials (ammonia, isopropol alcohol, etc).
It would be unfortunate to see a beautiful pen damaged or dissolved by cleaning with the wrong supplies (especially since you mentioned that your friend was a "clean-freak".
maybe the following (once she's comfortable)
-How to tell if a pen is wet or dry. How to remedy with out doing things to the pen (using dry or wet inks).
-how to clean a pen safely
-vintage versus modern and pros/cons (celluloid is flammble)
-the joy of an inexpensive pen with a broad or stub nib: shimmering inks, sheening inks, no fear of ruining something super collectable/rare/vintage
-a bit about paper and how inks can look different on different surfaces (e.g. shee