Sounds like your wife's friend used the typical Watchtower excuses for their long, glorious history of false prophecies. Here, they simply redefine the word "prophecy" so narrowly that it's basically impossible to be a false prophet. As a side note, the Watchtower is comfortable with redefining words as it sees fit--see, for example, the latest "generation" debacle.
I would like to ask Watchtower followers such as your wife's friend if they can give me an example of any modern day false prophets. The Bible said there will be false prophets in the Last Days, and the JWs say that these are the Last Days. (for example, Matt. 24:11, 24; Mark 13:22). Thus, they should be able to point out some false prophets.
But the way the WTS contorts the meaning of "prophecy," it's hard to find any examples that would fit. As long as you can tie your prediction to a "Bible prophecy" then you run no risk of being a false prophet--rather you're just "keeping alert."
Thus, Watchtower logic excuses hucksters like Hal Lindsey (Late Great Planet Earth) and Ed Whisenant (88 Reasons Why the Rapture Will Be in 1988) from being false prophets because those guys tie their predictions to Daniel, Revelation, etc. Heck, even David Koresh based his predictions on the Bible. But none of these hucksters are false prophets in Watchtower-land!
So in order to be a "false prophet" under Watchtower logic, you've got to make up something from whole cloth and claim that God gave it directly to you. Every Christian End-Times doomsday predictor from Miller to Russell to Rutherford to Lindsey to Franz to Whisenant to Koresh has tried to tie his predictions to the Bible.
Thus, the Watchtower has absolved all of these clowns of false prophecy. Too funny.