She should have used deut 18 which is very clear what make someone a false prophet, witnesses simply don't qualify.
Deuteronomy 18:18-22
18 I will raise up for them a prophet like you from among their brothers; I will put my words in his mouth, and he will tell them everything I command him. 19 If anyone does not listen to my words that the prophet speaks in my name, I myself will call him to account. 20 But a prophet who presumes to speak in my name anything I have not commanded him to say, or a prophet who speaks in the name of other gods, must be put to death."
21 You may say to yourselves, "How can we know when a message has not been spoken by the Jehovah?" 22 If what a prophet proclaims in the name of Jehovah does not take place or come true, that is a message Jehovah has not spoken. That prophet has spoken presumptuously. Do not be afraid of him.
This is the bible set understanding of inspired prophecy. Witnesses have never claimed to hear and speak words directly from Jehovah. they have never claimed inspiration!
All our understandings come from reasoning on already written bible prophecies and chronology. This is not the same. And you cannot twist it to be the same.
I should warn you that you are correct that Witnesses may get disturb by your learned rhetoric from these forums. It is very unoriginal especially quoting CoC arguments and it will show you up as someone that has bought all the apostate propaganda hook,line and sinker.
All the things you hear from people that are against witnesses can be reasoned on and seen for the faulty reasoning they are, especially against the bible's teachings which are clear.
I am speaking frankly to you and I hope you don't take offense but you words show you have made a commitment to the propaganda you have heard off here and are now repeating it outside these forums and so it is already having real consequences in your life and may lead to more.