I've heard of this (and done this) with Cymbidiums, but not with any other kind of orchid. Although, now that you mention it, it seems like it might be a good idea for other cool growers, like Miltonia or even some Pleurothallids . . .
At any rate. My guess is that she's probably not crazy, although it's hard to say without meeting her. But what type of orchids does she do this with?