She's a bundle of joy, isn't she? On any other case, I'd take her at face value and just assume she's a weird but harmless local.
Hint 2
On this case, however, no one is what they seem. Nancy will set the right tone when she talks to her -- pleasant, but not spewing out personal information.
Hint 3
Bridget does have her uses, though; if you ask her for info about Scotland, she'll volunteer to go get you a book of local history. The next time you see her, remember to ask for it.