She's a contributor to Tor. Refusing to talk to her lawyer and saying they're going to pounce on her uninvited out of nowhere is harassment in my eyes.
I think it's reasonable for them to contact her and ask her questions, but they should go through the lawyer if she wants them to.
She mentioned she works on the Tor project and asks the question if her participation is relevant in this case. That part isn't made up.
I find it reasonable for someone to assume that their participation in a currently legal (but controversial) project would be a potential reason that the FBI wanted to question you.
It's not that much of a stretch to imagine that the reason the FBI are threatening to abduct her off the street and deny her the right to legal counsel is somehow related to her being a major Tor contributor.
I think it's reasonable for them to contact her and ask her questions, but they should go through the lawyer if she wants them to.