As to vagueness, most JWs are indeed vague in their response, dear IO (peace to you!) for two reasons: either they don't actually know the answer... or the answer is so asinine (or unsubstantiated by the Bible... or any other source, other than their publications), even they can't bring themselves to state it. Many don't even know the answer(s) as the WTBTS teach them. If it goes any deeper than the surface of the basic tenets of their religion (heavenly/earthly hopes, 144,000, great crowd, Armageddon, the FDS, Bethe[lites], Watchtower/Awake!, etc.), they usually go blank. Many don't even realize when there's "new light', as someone pointed out elsewhere. Thus, some are still teaching things that changed over 10-15 years ago.
As to generic, the entire religious system of the JWs is based upon rehearsed, contrived, generic responses to certain questions. There are about 200 "generic" questions for which answers have been decided and provided by the WTBTS in one or two books:
1. "Organized to Accomplish Our Ministry" - I'm not sure if they use this one any longer. If so, it's designed for those who wish to get baptized, are newly baptized but struggling, being reinstated but still harboring some "worldy" traits and thinking, etc. It's used to determine if one is "ready" to BE baptized [into the WTBTS] or to associate with its members once again. The marvel of this book is that more often than not they don't want to you TELL them what the answers are (at least, my elders didn't), but READ them directly from the book. Which made me wonder, at the time, how they knew if one WAS ready. I since learned that so long as one can read the answers (they ask the questions in order vs. randomly), they're considered "ready."
2. "Reasoning from the Scriptures" - This is now their "Bible." Well, at least, for the elders. In it, they've taken the most FAQs and given written answers, along with scriptures and verses that are supposed to "support" their position (but many times does not; but they don't like to hear that). They will turn to this before they turn to the Bible. Heck, before they turn to common sense.
This latter one is very much like the politician who has already rehearsed answers that skirt around questions he/she KNOWS will be asked. Your friends response most likely came from this book. If not... it almost certainly came from another WTBTS book. Don't judge her, though, as it was probably the best SHE could do, given what SHE does... or doesn't... know.
I bid you peace!
A slave of Christ,
SA