My own mother hit me and then Threatened me, what would have you done if it happen to you??

So basically, yesterday I went to wash my little one in the shower room (as we don’t have a bath in there) and as I was washing her, she had a fall/fell on the wet floor. I was trying to be careful and she heard a bang and run up and sooonn… comes at me and started hiting me JUST BECAUSE an accident had happened. I told her, it was and she wasn’t having it and hit me in front of my daughter (wasn’t the first time she hasn’t done that) I’m just fed up and annoyed at her at this point. She also threatened me saying she would get a knife. What kind of mother does that to their OWN daughter (adult daughter) Just done with it all and I definitely need to protect myself and my well being plus, my daughter, I wouldn’t want my daughter to grow up in that type of environment nor space in a house like that. What would you do??