Reddit mentions of Everything Eyes: Professional Techniques * Essential Tools * Gorgeous Makeup Looks (Bobbi Brown)

I'm so happy for this thread! In American libraries, go to 646 to find cosmetics. I would totally encourage you to stop in next time you're near your local branch, because free makeup books are awesome.

Sephora's book would be great for beginners, lots of pictures, and has some product suggestions as well.

I also liked Carmindy's books for beginners or easy looks. They're easy, approachable, photo-heavy.

Paula Begoun's Beauty Bible has a very dense chapter about classic makeup and application. I definitely recommend it if you want to learn application for work, or formal or conservative situations. If you're more into fashionable and creative makeup it has less to offer there, though it's probably still worth a skim.

Color Me Beautiful (website) was the 90's classic for finding your undertone.
Life in Color by Jesse Garza is a beautiful newer book, mostly about clothes but it has a chapter on coloring and makeup. I think this one's great for learning about complementary colors.

How to Look Expensive has a fun chapter about makeup, which is not really about looking expensive. It has a couple pretty tutorials and lots of dupes.

Bobbi Brown has a new book, Everything Eyes (2014). I only flipped through it but it looked gorgeous. Check it out for applications for various eye shapes and makeup for glasses. Her books Living Beauty and Beauty Evolution are also great if you're starting with makeup in your 30s or later.

Robert Jones has a kind of specific personal style and uses a limited color palette, but I think I recall his books have a lot about contouring, eye makeup, and formal occasions/photos (edit grammar).

There are a lot of really good books out there written by professional makeup artists and people in the industry. They are a good source of information for anyone interested in learning more about technique. A lot of makeup is hands on and practicing what works, but there is the side that also needs to know what would work for someone different than your usual test subjest (yourself) and how to fix problems as they happen. Here are a few I really like, but there are so many great ones to choose from, so ask her to looks and see which ones sound the best for what she already knows or knows she wants to learn. Other than that, I think the fact that you are asking here is great and a show of support like that will help her succeed in any endeavor. Best of luck!

Book 1
Book 2
Book 3

Edit: Fixed broken links.