> Worst case I can think of is the FBI asks a question with at least one potential answer that would incriminate her, she feels uncomfortable answering for whatever reason, and the FBI then interprets her ending the call there as suspicious
If there was any kind of criminal suspicion involved, they would absolutely do that. That's why talking to law enforcement is something you have a lawyer do.
In my other reply (https://news.ycombinator.com/item?id=11631827) I pointed out that she could call them, tell them she's not answering any questions, and just wants to know what they want. If she tells them upfront she won't answer questions (and sticks to that), then when they tell her what they want, not answering their question isn't suspicious.
But they won't talk to the actual lawyer involved. So what I'm suggesting is that she either simply tell them "Talk to my lawyer <name>, he represents me in this case" (since their excuse for not talking before was they don't believe the lawyer necessarily represents her), or to just tell them she's not answering questions but them to tell her what they want. Then she can talk to her lawyer again about whatever it is they say to her.
But it is her problem. Didn't you read the blog post? The fact that they want to talk to her and she doesn't know why is a source of considerable anxiety for her and is interfering with work.
The FBI only has to do that if they really care about resolving it. If the FBI doesn't care too much about resolving it (and obviously they don't care enough to actually talk to her lawyer about it), then it'll just stay unresolved and continue to cause anxiety to the woman involved.
And again... that's their problem, not hers. Her only reasonably prudent action at that point was to do nothing. Talking to the FBI directly instead of letting her lawyer handle it could have just made things worse.
If the FBI actually wanted anything to get done instead of just harassing her, they should have talked to her lawyer.
If there was any kind of criminal suspicion involved, they would absolutely do that. That's why talking to law enforcement is something you have a lawyer do.