Well, I certainly didnt expect this volume of responses. I guess, for the sake of everyone who has given advice, i pretty much HAVE to go for it now and tell you all how it went, right?
Im going to take a selection of the advice offered and bundle it all into one plan, which is as follows:
I cant really ask her for a book reccommendation, as Im writing about witchcraft in my local village. Chances are, she wont have read anything on the subject. But, already, I have a lot of books I want to look up, so I can always ask her to give me a hand ordering them in and hey presto, conversation begins! Other than that, be confident, test the water and if things go well and we strike up a rapport, ask her if she wants to go for a drink after work. You dont get if you dont ask, right?
I'll report back as soon as I have news. Thanks everyone!