My son's great grandmother hit me in the funeral home

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I was sitting there running my hand's through Gaje's hair. The great grandmother from the real mother's side of the family, was there. I was just about to leave with my husband, his job couldn't get his computer unlocked so we had to go unlock it for them. I was trying to be discreet about what I was doing but the great grandmother walked up beside me. When I turned around to leave with my husband, she punched me in my back. I was in shock, she done it right in front of the casket. I looked at her and never said a word, I just walked out the door. I got in the car and began to tell my husband about it. I told him that i have had enough and that this was very rude and disrespectful. I am a hott head and I had to walk out of there before I did something because they were gettign out of hand and I was not going to be the project of beating an older lady inside of a funeral home. He called his mother who told him that she probably didn't mean anything by it. I was outraged. They were sitting there taking up for people who have never been there. I could not believe that she did this in the funeral home and in front of my friends. I had never even said anything cross towards them, infact, I hadn't even spoken to them. What should I have done?