Try not to worry about this. The unfortunate thing about email is that people can forward things. I always try to think about the fact that any email I send might be forwarded. So, in that regard, NLS4life, can forward it, even though it is poor manners to do so.
Also, I think it is fine to have this thread on here. If Hogan finds out about it, so what? It is stuff that she needs to know. And I am sure she has a thick enough skin that she can take it.
But you don't have to apologize for doing this thread, and no one has to apologize for making comments either. Think First Amendment! NLS4life needs to understand appropriateness. It is not inappropriate that you started this thread. It is not inappropriate that you didn't talk to Hogan first. It is inappropraite that NLS4life keeps arguing with you. It is not her business. But it doesn't really matter.
Don't worry about her. And think happy thoughts. Maybe that class will get better as a result of this.
And I do hope that NLS4life has bigger things to worry about.