Glad you book arrived...it's good isn't it? If you think your W may not communicate enough with you to determine her Love Language...flat-out ask her, your W doesn't seem to be an unreasonable woman. Sure, she doesn't want to be hammered at all the time by this I'm sure....but if you bring up this really interesting book you've read and just let her know you'd like to ask her a couple of things and get her "opinion" as to what's important to her....you might get the responses you need
That is the approach that often works best with my H. If he feels that I'm trying to disect him (so-to-speak) he clams up, but if I ask questions and ask for his opinion I get MUCH more information.