Yeah. The label seems off to me. It might have been one of the newer 750ml bottles of Maredsous wrapped in paper, but the label sounds most like Rochefort 8 to me, although 8 is a dubbel and nothing like a wheat beer.
But the "really long neck" thing really stands out as something like Rochefort, Orval, and Westmalle.
And I hope she didn't mean Stella.