Talking to law enforcement is the job of your lawyer. If law enforcement refuses to talk to your lawyer, is it really that far-fetched to think they may want to do other things outside the bounds of the usual legal process?
See this from a cop and a law professor https://www.youtube.com/watch?v=6wXkI4t7nuc
They're using bully tactics. Did they have to show up on her family's doorstep? No. Did they really have people watching out for her in five cities? No. Was there any reason they couldn't communicate through her lawyer? No. Did they have to speak to her in person? No. Do they have the right to circumvent her legal counsel (or make threats to do so)? No.
They're just playing mind games, like they're trained to do. Spooks gonna spook.
There is a huge whiff of shadiness about how the agents were behaving. Maybe they had a good reason and just wanted her help, but everything screams watch the fuck out or end up like Aaron Swartz.