I don't believe any of the stuff about her being abusive tbh.
I believe it all, as it's come from various sources, at various times. Someone who is not difficult doesn't lose three staff members in a matter of months. They also aren't spoken to by HMQ herself.
Re PR - I know someone who works PR in Hollywood. He has A list clients, as well as less famous clients. He said that celebrities get "in trouble" when they do anything on social media on their own - something live (i.e., not controlled by their PR), or just posting on twitter (usually).