Were My Rights Violated?

My sister ped away about 3 years ago. I'd gotten into a huge argument with her older daughter (my sister knew nothing of this) because my niece had been treating my sister like garbage, and here the poor woman was dying of cancer. This altercation took place in a nursing home, but as I said my sister heard none of this. My niece called me a dirty name so I called her one back and a nurse told me to leave, so I did. This niece had a memorial service for her mother but I did not go because of the terrible argument we'd had (I'd been defending my sister, as my niece had been so nasty to her and showed her NO mercy, even though she was in the last stages of cancer). Hard to fathom, I know, but this niece is nasty to EVERYONE, I'm not exaggerating. Anyhow, I found out later that my niece has a friend who is married to a police officer, and she claimed she'd have had me arrested if I'd gone to the service at the funeral home, a public place of course. Would this have been legal if I'd done nothing wrong, but just attended? By the way, the memorial took place in a state other than the one this man is a police officer in. I don't break laws, and had I attended I certainly would not have done anything inappropriate. Could I have been arrested just for being there? I was denied the last opportunity to pay my respects for my dear sister, and of course I can never get that chance back. In my opinion, what this daughter of hers did was vicious and inexcusable. I had no intention of doing anything improper. Would it do me any good to report the police officer to his chief? I'm not sure, but I don't think a person can be prevented from attending a service in a public building, unless they cause a scene or something and I would never in a million years have done that. Also, my niece called me a vile name in the nursing home and all I did was reciprocate (quietly). Why wasn't she told to leave? Wasn't that discrimination? I'm wondering if I have a legal case - anyone know, or have any advice as to whether I can take legal action? Thank you in advance.