Difficult indeed. I hate that she's in that position. I am not sure how their company works and whether anonymous reports are even possible. That's why I think perhaps it's better to let it play out and let that woman be her own downfall from lack of production and meeting objectives. All I can do is be a sounding board for my friend and remind her to see the bigger picture.
I do hope we can turn it around, at the moment it's depressing that to keep your job you have to put up with abuse of every description. Very sad. Thanks for commenting @cmplxty