It's too stupid for them to have made it up. It's also too dangerous. Mangum, feeling pushed into a corner, may have recorded the conversation if she's been being pushed by them. Even if she didn't, them putting words into her mouth and then her hiring an attorney to go after them would be the final straw for Nifong. That is suborning perjury, and not even NC can overlook that. That is a very, very serious charge and is most serious against a prosecutor. Further, it would open them up to even more civil liabilities and would remove any doubt from the state bar as to whether or not Nifong should be disbarred. At this juncture, putting ANY words in that crazy broad's mouth is like playing with nitro-glycerine. The very last thing Nifong needed at this point was for Mangum to change her story again, especially to THIS story that affects her timeline, because Nifong made a statement months ago about, "What if I have a different timeline?" Because he said that, and now Mangum has a different timeline than the one she first told, it LOOKS like Nifong told her to come up with a new timeline, and THAT is the last thing he needs right now if he's going to save his own butt.
One other thing - her changing her story again makes it harder for Nifong to get this case to trial, not easier. It's already generated yet another motion from the defense that he has to contend with. Getting the case to trial benefits him. Not getting it to trial benefits her.